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{G}
Abundant Growth
Enchantment - Aura
Enchant land

When Abundant Growth enters the battlefield, draw a card.

Enchanted land has "{T}: Add one mana of any color."
{U}
Aqueous Form
Enchantment - Aura
Enchant creature

Enchanted creature can't be blocked.

Whenever enchanted creature attacks, scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)
{2}{G}{U}
Arixmethes, Slumbering Isle
Legendary Creature - Kraken
Arixmethes, Slumbering Isle enters the battlefield tapped with five slumber counters on it.

As long as Arixmethes has a slumber counter on it, it's a land. (It's not a creature.)

Whenever you cast a spell, you may remove a slumber counter from Arixmethes.

{T}: Add {G}{U}.
12 / 12
{U}
Aura Finesse
Instant
Attach target Aura you control to target creature.

Draw a card.
{U}
Betrayal
Enchantment - Aura
Enchant creature an opponent controls

Whenever enchanted creature becomes tapped, you draw a card.
{2}{U}{U}
Bident of Thassa
Legendary Enchantment Artifact
Whenever a creature you control deals combat damage to a player, you may draw a card.

{1}{U}, {T}: Creatures your opponents control attack this turn if able.
{6}{U}{U}
Brinelin, the Moon Kraken
Legendary Creature - Kraken
When Brinelin, the Moon Kraken enters the battlefield or whenever you cast a spell with mana value 6 or greater, you may return target nonland permanent to its owner's hand.

Partner (You can have two commanders if both have partner.)
6 / 8
{3}{U}{U}
Cache Raiders
Creature - Merfolk Rogue
At the beginning of your upkeep, return a permanent you control to its owner's hand.
4 / 4
{1}{G}
Canopy Cover
Enchantment - Aura
Enchant creature

Enchanted creature can't be blocked except by creatures with flying or reach.

Enchanted creature can't be the target of spells or abilities your opponents control.
{2}{U}
Chasm Skulker
Creature - Squid Horror
Whenever you draw a card, put a +1/+1 counter on Chasm Skulker.

When Chasm Skulker dies, create X 1/1 blue Squid creature tokens with islandwalk, where X is the number of +1/+1 counters on Chasm Skulker. (They can't be blocked as long as defending player controls an Island.)
1 / 1
--
Coral Atoll
Land
Coral Atoll enters the battlefield tapped.

When Coral Atoll enters the battlefield, sacrifice it unless you return an untapped Island you control to its owner's hand.

{T}: Add {C}{U}.
{7}{U}{U}{U}
Deep-Sea Kraken
Creature - Kraken
Deep-Sea Kraken can't be blocked.

Suspend 9--{2}{U} (Rather than cast this card from your hand, you may pay {2}{U} and exile it with nine time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost. It has haste.)

Whenever an opponent casts a spell, if Deep-Sea Kraken is suspended, remove a time counter from it.
6 / 6
{2}{G}{G}
Eidolon of Blossoms
Enchantment Creature - Spirit
Constellation -- Whenever Eidolon of Blossoms or another enchantment enters the battlefield under your control, draw a card.
2 / 2
{U}
Energy Tap
Sorcery
Tap target untapped creature you control. If you do, add an amount of {C} equal to that creature's mana value.
--
Fertile Thicket
Land
Fertile Thicket enters the battlefield tapped.

When Fertile Thicket enters the battlefield, you may look at the top five cards of your library. If you do, reveal up to one basic land card from among them, then put that card on top of your library and the rest on the bottom in any order.

{T}: Add {G}.
{4}{U}
Floodtide Serpent
Creature - Serpent
Floodtide Serpent can't attack unless you return an enchantment you control to its owner's hand. (This cost is paid as attackers are declared.)
4 / 4
{G}
Font of Fertility
Enchantment
{1}{G}, Sacrifice Font of Fertility: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
{G}
Frog Tongue
Enchantment - Aura
Enchant creature

When Frog Tongue enters the battlefield, draw a card.

Enchanted creature has reach. (It can block creatures with flying.)
{2}{G}
Gift of Paradise
Enchantment - Aura
Enchant land

When Gift of Paradise enters the battlefield, you gain 3 life.

Enchanted land has "{T}: Add two mana of any one color."
--
Havenwood Battleground
Land
Havenwood Battleground enters the battlefield tapped.

{T}: Add {G}.

{T}, Sacrifice Havenwood Battleground: Add {G}{G}.
{1}{U}
Hidden Strings
Sorcery
You may tap or untap target permanent, then you may tap or untap another target permanent.

Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)
{U}{U}
Homarid Spawning Bed
Enchantment
{1}{U}{U}, Sacrifice a blue creature: Create X 1/1 blue Camarid creature tokens, where X is the sacrificed creature's mana value.
{4}{G}{G}
Humbler of Mortals
Enchantment Creature - Elemental
Constellation -- Whenever Humbler of Mortals or another enchantment enters the battlefield under your control, creatures you control gain trample until end of turn.
5 / 5
{5}{U}
Infinite Reflection
Enchantment - Aura
Enchant creature

When Infinite Reflection enters the battlefield attached to a creature, each other nontoken creature you control becomes a copy of that creature.

Nontoken creatures you control enter the battlefield as a copy of enchanted creature.
{G}
Instill Energy
Enchantment - Aura
Enchant creature

Enchanted creature can attack as though it had haste.

{0}: Untap enchanted creature. Activate only during your turn and only once each turn.
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
--
Island
Basic Land - Island
({T}: Add {U}.)
{2}{U}
Jolt
Instant
You may tap or untap target artifact, creature, or land.

Draw a card at the beginning of the next turn's upkeep.
--
Jungle Basin
Land
Jungle Basin enters the battlefield tapped.

When Jungle Basin enters the battlefield, sacrifice it unless you return an untapped Forest you control to its owner's hand.

{T}: Add {C}{G}.
{1}{U}
Kasmina's Transmutation
Enchantment - Aura
Enchant creature

Enchanted creature loses all abilities and has base power and toughness 1/1.
{U}
Kiora's Dismissal
Instant
Strive -- This spell costs {U} more to cast for each target beyond the first.

Return any number of target enchantments to their owners' hands.
{G}{U}
Kiora's Follower
Creature - Merfolk
{T}: Untap another target permanent.
2 / 2
{2}{G/U}
Kiora, Behemoth Beckoner
Legendary Planeswalker - Kiora
Whenever a creature with power 4 or greater enters the battlefield under your control, draw a card.

-1: Untap target permanent.
L: 7
{5}{U}{U}
Kraken of the Straits
Creature - Kraken
Creatures with power less than the number of Islands you control can't block Kraken of the Straits.
6 / 6
{5}{U}{U}{U}{U}
Leviathan
Creature - Leviathan
Trample

Leviathan enters the battlefield tapped and doesn't untap during your untap step.

At the beginning of your upkeep, you may sacrifice two Islands. If you do, untap Leviathan.

Leviathan can't attack unless you sacrifice two Islands. (This cost is paid as attackers are declared.)
10 / 10
{1}{G}
Lignify
Tribal Enchantment - Treefolk Aura
Enchant creature

Enchanted creature is a Treefolk with base power and toughness 0/4 and loses all abilities.
--
Lonely Sandbar
Land
Lonely Sandbar enters the battlefield tapped.

{T}: Add {U}.

Cycling {U} ({U}, Discard this card: Draw a card.)
{X}{G}
Mana Bloom
Enchantment
Mana Bloom enters the battlefield with X charge counters on it.

Remove a charge counter from Mana Bloom: Add one mana of any color. Activate only once each turn.

At the beginning of your upkeep, if Mana Bloom has no charge counters on it, return it to its owner's hand.
{3}{G}
Market Festival
Enchantment - Aura
Enchant land

Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors.
{3}{U}
Master of Waves
Creature - Merfolk Wizard
Protection from red

Elemental creatures you control get +1/+1.

When Master of Waves enters the battlefield, create a number of 1/0 blue Elemental creature tokens equal to your devotion to blue. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.)
2 / 1
{1}{U}
Meletis Astronomer
Creature - Human Wizard
Heroic -- Whenever you cast a spell that targets Meletis Astronomer, look at the top three cards of your library. You may reveal an enchantment card from among them and put it into your hand. Put the rest on the bottom of your library in any order.
1 / 3
{1}{U}
Military Intelligence
Enchantment
Whenever you attack with two or more creatures, draw a card.
{U}
Mystic Remora
Enchantment
Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays {4}.
{2}{G}
New Horizons
Enchantment - Aura
Enchant land

When New Horizons enters the battlefield, put a +1/+1 counter on target creature you control.

Enchanted land has "{T}: Add two mana of any one color."
{X}{G}{U}
Nimbus Swimmer
Creature - Leviathan
Flying

Nimbus Swimmer enters the battlefield with X +1/+1 counters on it.
0 / 0
{1}{G}
Nylea's Presence
Enchantment - Aura
Enchant land

When Nylea's Presence enters the battlefield, draw a card.

Enchanted land is every basic land type in addition to its other types.
{2}{G}
Oath of the Ancient Wood
Enchantment
Whenever Oath of the Ancient Wood or another enchantment enters the battlefield under your control, you may put a +1/+1 counter on target creature.
{2}{U}
Ophidian Eye
Enchantment - Aura
Flash (You may cast this spell any time you could cast an instant.)

Enchant creature

Whenever enchanted creature deals damage to an opponent, you may draw a card.
{3}{U}
Oracle's Insight
Enchantment - Aura
Enchant creature

Enchanted creature has "{T}: Scry 1, then draw a card." (To scry 1, look at the top card of your library, then you may put that card on the bottom of your library.)
{8}{U}{U}{U}
Polar Kraken
Creature - Kraken
Trample

Polar Kraken enters the battlefield tapped.

Cumulative upkeep--Sacrifice a land. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
11 / 11
--
Remote Isle
Land
Remote Isle enters the battlefield tapped.

{T}: Add {U}.

Cycling {2} ({2}, Discard this card: Draw a card.)
{2}{U}
Retreat to Coralhelm
Enchantment
Landfall -- Whenever a land enters the battlefield under your control, choose one --

• You may tap or untap target creature.

• Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)
{2}{U}
Riptide Chimera
Enchantment Creature - Chimera
Flying

At the beginning of your upkeep, return an enchantment you control to its owner's hand.
3 / 4
{2}{U}{U}
Rootwater Matriarch
Creature - Merfolk
{T}: Gain control of target creature for as long as that creature is enchanted.
2 / 3
{2}{U}
Rootwater Shaman
Creature - Merfolk Shaman
You may cast Aura spells with enchant creature as though they had flash.
2 / 2
{5}{U}{U}
Scrapdiver Serpent
Creature - Serpent
Scrapdiver Serpent can't be blocked as long as defending player controls an artifact.
5 / 5
{2}{U}
Scroll Thief
Creature - Merfolk Rogue
Whenever Scroll Thief deals combat damage to a player, draw a card.
1 / 3
{1}{G}
Seal of Primordium
Enchantment
Sacrifice Seal of Primordium: Destroy target artifact or enchantment.
{U}
Shimmering Wings
Enchantment - Aura
Enchant creature (Target a creature as you cast this. This card enters the battlefield attached to that creature.)

Enchanted creature has flying. (It can't be blocked except by creatures with flying or reach.)

{U}: Return Shimmering Wings to its owner's hand.
{4}{U}{U}
Shipbreaker Kraken
Creature - Kraken
{6}{U}{U}: Monstrosity 4. (If this creature isn't monstrous, put four +1/+1 counters on it and it becomes monstrous.)

When Shipbreaker Kraken becomes monstrous, tap up to four target creatures. Those creatures don't untap during their controllers' untap steps for as long as you control Shipbreaker Kraken.
6 / 6
--
Simic Guildgate
Land - Gate
Simic Guildgate enters the battlefield tapped.

{T}: Add {G} or {U}.
--
Skyline Cascade
Land
Skyline Cascade enters the battlefield tapped.

When Skyline Cascade enters the battlefield, target creature an opponent controls doesn't untap during its controller's next untap step.

{T}: Add {U}.
{6}{U}{U}
Slinn Voda, the Rising Deep
Legendary Creature - Leviathan
Kicker {1}{U} (You may pay an additional {1}{U} as you cast this spell.)

When Slinn Voda, the Rising Deep enters the battlefield, if it was kicked, return all creatures to their owners' hands except for Merfolk, Krakens, Leviathans, Octopuses, and Serpents.
8 / 8
--
Slippery Karst
Land
Slippery Karst enters the battlefield tapped.

{T}: Add {G}.

Cycling {2} ({2}, Discard this card: Draw a card.)
{2}{U}
Slow Motion
Enchantment - Aura
Enchant creature

At the beginning of the upkeep of enchanted creature's controller, that player sacrifices that creature unless they pay {2}.

When Slow Motion is put into a graveyard from the battlefield, return Slow Motion to its owner's hand.
{2}{G}
Snake Umbra
Enchantment - Aura
Enchant creature

Enchanted creature gets +1/+1 and has "Whenever this creature deals damage to an opponent, you may draw a card."

Totem armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)
--
Svyelunite Temple
Land
Svyelunite Temple enters the battlefield tapped.

{T}: Add {U}.

{T}, Sacrifice Svyelunite Temple: Add {U}{U}.
{3}{U}
Thassa's Emissary
Enchantment Creature - Crab
Bestow {5}{U} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)

Whenever Thassa's Emissary or enchanted creature deals combat damage to a player, draw a card.

Enchanted creature gets +3/+3.
3 / 3
{U}
Thassa's Ire
Enchantment
{3}{U}: You may tap or untap target creature.
{2}{U}
Thassa, God of the Sea
Legendary Enchantment Creature - God
Indestructible

As long as your devotion to blue is less than five, Thassa isn't a creature. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.)

At the beginning of your upkeep, scry 1.

{1}{U}: Target creature you control can't be blocked this turn.
5 / 5
--
Thornwood Falls
Land
Thornwood Falls enters the battlefield tapped.

When Thornwood Falls enters the battlefield, you gain 1 life.

{T}: Add {G} or {U}.
--
Tranquil Thicket
Land
Tranquil Thicket enters the battlefield tapped.

{T}: Add {G}.

Cycling {G} ({G}, Discard this card: Draw a card.)
{2}{U}
Traveler's Cloak
Enchantment - Aura
Enchant creature

As Traveler's Cloak enters the battlefield, choose a land type.

When Traveler's Cloak enters the battlefield, draw a card.

Enchanted creature has landwalk of the chosen type. (It can't be blocked as long as defending player controls a land of that type.)
{3}{U}
Triton Cavalry
Creature - Merfolk Soldier
Heroic -- Whenever you cast a spell that targets Triton Cavalry, you may return target enchantment to its owner's hand.
2 / 4
{2}{U}
Triton Fortune Hunter
Creature - Merfolk Soldier
Heroic -- Whenever you cast a spell that targets Triton Fortune Hunter, draw a card.
2 / 2
{U}
Twiddle
Instant
You may tap or untap target artifact, creature, or land.
{2}{G}
Verdant Haven
Enchantment - Aura
Enchant land

When Verdant Haven enters the battlefield, you gain 2 life.

Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color.
{1}{G}{G}
Verduran Enchantress
Creature - Human Druid
Whenever you cast an enchantment spell, you may draw a card.
0 / 2
{1}{U}
Volrath's Curse
Enchantment - Aura
Enchant creature

Enchanted creature can't attack or block, and its activated abilities can't be activated. That creature's controller may sacrifice a permanent for that player to ignore this effect until end of turn.

{1}{U}: Return Volrath's Curse to its owner's hand.
{1}{G}
Voyaging Satyr
Creature - Satyr Druid
{T}: Untap target land.
1 / 2
{2}{U}
Wavecrash Triton
Creature - Merfolk Wizard
Heroic -- Whenever you cast a spell that targets Wavecrash Triton, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.
1 / 4
{2}{G}
Weirding Wood
Enchantment - Aura
Enchant land

When Weirding Wood enters the battlefield, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")

Enchanted land has "{T}: Add two mana of any one color."
{3}{U}{U}
Whitewater Naiads
Enchantment Creature - Nymph
Constellation -- Whenever Whitewater Naiads or another enchantment enters the battlefield under your control, target creature can't be blocked this turn.
4 / 4
{G}
Wild Growth
Enchantment - Aura
Enchant land

Whenever enchanted land is tapped for mana, its controller adds an additional {G}.
--
Woodland Stream
Land
Woodland Stream enters the battlefield tapped.

{T}: Add {G} or {U}.

{1}{U}{U}
Apprentice Wizard
Creature - Human Wizard
{U}, {T}: Add {C}{C}{C}.
0 / 1
{U}
Aquitect's Will
Tribal Sorcery - Merfolk
Put a flood counter on target land. That land is an Island in addition to its other types for as long as it has a flood counter on it. If you control a Merfolk, draw a card.
{U}
Caller of Gales
Creature - Merfolk Wizard
{1}{U}, {T}: Target creature gains flying until end of turn.
1 / 1
{1}{U}
Cleric of Chill Depths
Creature - Merfolk Cleric
Whenever Cleric of Chill Depths blocks a creature, that creature doesn't untap during its controller's next untap step.
1 / 3
{1}{U}
Coral Trickster
Creature - Merfolk Rogue
Morph {U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

When Coral Trickster is turned face up, you may tap or untap target permanent.
2 / 1
{1}{U}
Crypsis
Instant
Target creature you control gains protection from creatures your opponents control until end of turn. Untap it.
{U}
Cursecatcher
Creature - Merfolk Wizard
Sacrifice Cursecatcher: Counter target instant or sorcery spell unless its controller pays {1}.
1 / 1
{2}{U}
Deeproot Waters
Enchantment
Whenever you cast a Merfolk spell, create a 1/1 blue Merfolk creature token with hexproof. (A creature with hexproof can't be the target of spells or abilities your opponents control.)
{1}{U}
Deeptread Merrow
Creature - Merfolk Rogue
{U}: Deeptread Merrow gains islandwalk until end of turn. (It can't be blocked as long as defending player controls an Island.)
2 / 1
{6}{U}{U}
Denizen of the Deep
Creature - Serpent
When Denizen of the Deep enters the battlefield, return each other creature you control to its owner's hand.
11 / 11
{U}
Drowner Initiate
Creature - Merfolk Wizard
Whenever a player casts a blue spell, you may pay {1}. If you do, target player mills two cards.
1 / 1
{2}{G}
Elemental Bond
Enchantment
Whenever a creature with power 3 or greater enters the battlefield under your control, draw a card.
{U}
Enclave Cryptologist
Creature - Merfolk Wizard
Level up {1}{U} ({1}{U}: Put a level counter on this. Level up only as a sorcery.)

LEVEL 1-2

0/1

{T}: Draw a card, then discard a card.

LEVEL 3+

0/1

{T}: Draw a card.
0 / 1
{1}{U}
Fishliver Oil
Enchantment - Aura
Enchant creature (Target a creature as you cast this. This card enters the battlefield attached to that creature.)

Enchanted creature has islandwalk. (It can't be blocked as long as defending player controls an Island.)
{1}{G}{U}
Gyre Engineer
Creature - Vedalken Wizard
{T}: Add {G}{U}.
1 / 1
{U}
High Tide
Instant
Until end of turn, whenever a player taps an Island for mana, that player adds an additional {U}.
{U}{U}
Homarid Spawning Bed
Enchantment
{1}{U}{U}, Sacrifice a blue creature: Create X 1/1 blue Camarid creature tokens, where X is the sacrificed creature's mana value.
{2}{U}
Infuse
Instant
Untap target artifact, creature, or land.

Draw a card at the beginning of the next turn's upkeep.
{7}{U}{U}
Inkwell Leviathan
Artifact Creature - Leviathan
Trample

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Shroud (This creature can't be the target of spells or abilities.)
7 / 11
{1}{G}{U}
Kumena, Tyrant of Orazca
Legendary Creature - Merfolk Shaman
Tap another untapped Merfolk you control: Kumena, Tyrant of Orazca can't be blocked this turn.

Tap three untapped Merfolk you control: Draw a card.

Tap five untapped Merfolk you control: Put a +1/+1 counter on each Merfolk you control.
2 / 4
{U}{U}
Lord of Atlantis
Creature - Merfolk
Other Merfolk get +1/+1 and have islandwalk. (They can't be blocked as long as defending player controls an Island.)
2 / 2
{1}{U}
Merrow Commerce
Tribal Enchantment - Merfolk
At the beginning of your end step, untap all Merfolk you control.
{3}{U}{U}
Mesmerizing Benthid
Creature - Octopus
When Mesmerizing Benthid enters the battlefield, create two 0/2 blue Illusion creature tokens with "Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."

Mesmerizing Benthid has hexproof as long as you control an Illusion.
4 / 5
{U}
Mist-Cloaked Herald
Creature - Merfolk Warrior
Mist-Cloaked Herald can't be blocked.
1 / 1
{2}{U}
Mist-Syndicate Naga
Creature - Naga Ninja
Ninjutsu {2}{U} ({2}{U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever Mist-Syndicate Naga deals combat damage to a player, create a token that's a copy of Mist-Syndicate Naga.
3 / 1
--
Myriad Landscape
Land
Myriad Landscape enters the battlefield tapped.

{T}: Add {C}.

{2}, {T}, Sacrifice Myriad Landscape: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle.
{5}{U}{U}
Pearl Lake Ancient
Creature - Leviathan
Flash

This spell can't be countered.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Return three lands you control to their owner's hand: Return Pearl Lake Ancient to its owner's hand.
6 / 7
{1}{U}{U}
Pemmin's Aura
Enchantment - Aura
Enchant creature

{U}: Untap enchanted creature.

{U}: Enchanted creature gains flying until end of turn.

{U}: Enchanted creature gains shroud until end of turn. (It can't be the target of spells or abilities.)

{1}: Enchanted creature gets +1/-1 or -1/+1 until end of turn.
{2}{G}{G}{U}{U}
Prime Speaker Zegana
Legendary Creature - Merfolk Wizard
Prime Speaker Zegana enters the battlefield with X +1/+1 counters on it, where X is the greatest power among other creatures you control.

When Prime Speaker Zegana enters the battlefield, draw cards equal to its power.
1 / 1
{2}{U}{U}
Rootwater Matriarch
Creature - Merfolk
{T}: Gain control of target creature for as long as that creature is enchanted.
2 / 3
{2}{U}
Rootwater Shaman
Creature - Merfolk Shaman
You may cast Aura spells with enchant creature as though they had flash.
2 / 2
{5}{U}{U}
Scourge of Fleets
Creature - Kraken
When Scourge of Fleets enters the battlefield, return each creature your opponents control with toughness X or less to its owner's hand, where X is the number of Islands you control.
6 / 6
{5}{U}{U}
Scrapdiver Serpent
Creature - Serpent
Scrapdiver Serpent can't be blocked as long as defending player controls an artifact.
5 / 5
{3}{U}{U}
Sealock Monster
Creature - Octopus
Sealock Monster can't attack unless defending player controls an Island.

{5}{U}{U}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)

When Sealock Monster becomes monstrous, target land becomes an Island in addition to its other types.
5 / 5
{4}{U}
Serpent of the Endless Sea
Creature - Serpent
Serpent of the Endless Sea's power and toughness are each equal to the number of Islands you control.

Serpent of the Endless Sea can't attack unless defending player controls an Island.
* / *
{2}{G}{U}
Sharktocrab
Creature - Shark Octopus Crab
{2}{G}{U}: Adapt 1. (If this creature has no +1/+1 counters on it, put a +1/+1 counter on it.)

Whenever one or more +1/+1 counters are put on Sharktocrab, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.
4 / 4
{4}{U}{U}
Shipbreaker Kraken
Creature - Kraken
{6}{U}{U}: Monstrosity 4. (If this creature isn't monstrous, put four +1/+1 counters on it and it becomes monstrous.)

When Shipbreaker Kraken becomes monstrous, tap up to four target creatures. Those creatures don't untap during their controllers' untap steps for as long as you control Shipbreaker Kraken.
6 / 6
{4}{U}
Shoal Kraken
Creature - Kraken
Constellation -- Whenever an enchantment enters the battlefield under your control, you may draw a card. If you do, discard a card.
3 / 5
{4}{U}{U}{U}
Shrouded Serpent
Creature - Serpent
Whenever Shrouded Serpent attacks, defending player may pay {4}. If that player doesn't, Shrouded Serpent can't be blocked this turn.
4 / 4
{2}
Sky Diamond
Artifact
Sky Diamond enters the battlefield tapped.

{T}: Add {U}.
{1}{U}
Stonybrook Banneret
Creature - Merfolk Wizard
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Merfolk spells and Wizard spells you cast cost {1} less to cast.
1 / 1
{3}{G}{U}
Tatyova, Benthic Druid
Legendary Creature - Merfolk Druid
Landfall -- Whenever a land enters the battlefield under your control, you gain 1 life and draw a card.
3 / 3
--
Temple of Mystery
Land
Temple of Mystery enters the battlefield tapped.

When Temple of Mystery enters the battlefield, scry 1.

{T}: Add {G} or {U}.
{1}{U}
Thing in the Ice
Creature - Horror
Defender

Thing in the Ice enters the battlefield with four ice counters on it.

Whenever you cast an instant or sorcery spell, remove an ice counter from Thing in the Ice. Then if it has no ice counters on it, transform it.
0 / 4
--
Awoken Horror
Creature - Kraken Horror

When this creature transforms into Awoken Horror, return all non-Horror creatures to their owners' hands.
0 / 4
{3}{U}
Tidal Barracuda
Creature - Fish
Any player may cast spells as though they had flash.

Your opponents can't cast spells during your turn.
3 / 4
{1}{U}
Tidal Bore
Instant
You may return an Island you control to its owner's hand rather than pay this spell's mana cost.

You may tap or untap target creature.
{U}
Trickster Mage
Creature - Human Spellshaper
{U}, {T}, Discard a card: You may tap or untap target artifact, creature, or land.
1 / 1
{U}
Triton Tactics
Instant
Up to two target creatures each get +0/+3 until end of turn. Untap those creatures. At this turn's next end of combat, tap each creature that was blocked by one of those creatures this turn and it doesn't untap during its controller's next untap step.
{3}{G}{U}
Urban Evolution
Sorcery
Draw three cards. You may play an additional land this turn.