Equipped creature gets +3/+0 and is every creature type.
Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)
{1}{U}{U}
Ancient Crab
Creature - Crab
1 /
5
{3}{U}
Aquatic Incursion
Enchantment
When Aquatic Incursion enters the battlefield, create two 1/1 blue Merfolk creature tokens with hexproof. (They can't be the targets of spells or abilities your opponents control.)
{3}{U}: Target Merfolk can't be blocked this turn.
{2}
Armory of Iroas
Artifact - Equipment
Whenever equipped creature attacks, put a +1/+1 counter on it.
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)
{U}
Brainstorm
Instant
Draw three cards, then put two cards from your hand on top of your library in any order.
{3}
Brawler's Plate
Artifact - Equipment
Equipped creature gets +2/+2 and has trample. (It can deal excess combat damage to the player or planeswalker it's attacking.)
Equip {4} ({4}: Attach to target creature you control. Equip only as a sorcery.)
{2}{U}{U}
Charix, the Raging Isle
Legendary Creature - Leviathan Crab
Spells your opponents cast that target Charix, the Raging Isle cost {2} more to cast.
{3}: Charix gets +X/-X until end of turn, where X is the number of Islands you control.
0 /
17
{3}{U}
Clone
Creature - Shapeshifter
You may have Clone enter the battlefield as a copy of any creature on the battlefield.
0 /
0
{4}{U}
Cloudreader Sphinx
Creature - Sphinx
Flying
When Cloudreader Sphinx enters the battlefield, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)
3 /
4
{2}{U}
Compulsive Research
Sorcery
Target player draws three cards. Then that player discards two cards unless they discard a land card.
{2}{U}
Coral Commando
Creature - Merfolk Warrior
3 /
2
{3}{U}
Crystacean
Creature - Crab
Flash
1 /
6
{1}{U}
Curate
Instant
Surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
Draw a card.
{3}
Diamond Knight
Artifact Creature - Knight
Vigilance (Attacking doesn't cause this creature to tap.)
As Diamond Knight enters the battlefield, choose a color.
Whenever you cast a spell of the chosen color, put a +1/+1 counter on Diamond Knight.
1 /
1
{2}
Diamond Mare
Artifact Creature - Horse
As Diamond Mare enters the battlefield, choose a color.
Whenever you cast a spell of the chosen color, you gain 1 life.
1 /
3
{2}{U}
Fall from Favor
Enchantment - Aura
Enchant creature
When Fall from Favor enters the battlefield, tap enchanted creature and you become the monarch.
Enchanted creature doesn't untap during its controller's untap step unless that player is the monarch.
{U}{U}{U}
Fated Infatuation
Instant
Create a token that's a copy of target creature you control. If it's your turn, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)
--
Forge of Heroes
Land
{T}: Add {C}.
{T}: Choose target commander that entered the battlefield this turn. Put a +1/+1 counter on it if it's a creature and a loyalty counter on it if it's a planeswalker.
{3}{U}
Fortress Crab
Creature - Crab
1 /
6
{4}{U}{U}
Frilled Sea Serpent
Creature - Serpent
{5}{U}{U}: Frilled Sea Serpent can't be blocked this turn.
4 /
6
{2}{U}
Frost Lynx
Creature - Elemental Cat
When Frost Lynx enters the battlefield, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.
2 /
2
{2}{U}
Galestrike
Instant
Return target tapped creature to its owner's hand.
Draw a card.
{5}
Geode Golem
Artifact Creature - Golem
Trample
Whenever Geode Golem deals combat damage to a player, you may cast your commander from the command zone without paying its mana cost. (You still pay any additional costs.)
5 /
3
{U}
Giant's Amulet
Artifact - Equipment
When Giant's Amulet enters the battlefield, you may pay {3}{U}. If you do, create a 4/4 blue Giant Wizard creature token, then attach Giant's Amulet to it.
Equipped creature gets +0/+1 and has "This creature has hexproof as long as it's untapped." (It can't be the target of spells or abilities your opponents control.)
Equip {2}
{1}
Gingerbrute
Artifact Creature - Food Golem
Haste
{1}: Gingerbrute can't be blocked this turn except by creatures with haste.
{2}, {T}, Sacrifice Gingerbrute: You gain 3 life.
1 /
1
--
Guildless Commons
Land
Guildless Commons enters the battlefield tapped.
When Guildless Commons enters the battlefield, return a land you control to its owner's hand.
{T}: Add {C}{C}.
{U}{U}
Harbinger of the Tides
Creature - Merfolk Wizard
You may cast Harbinger of the Tides as though it had flash if you pay {2} more to cast it. (You may cast it any time you could cast an instant.)
When Harbinger of the Tides enters the battlefield, you may return target tapped creature an opponent controls to its owner's hand.
2 /
2
{4}{U}{U}
Harbor Serpent
Creature - Serpent
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Harbor Serpent can't attack unless there are five or more Islands on the battlefield.
5 /
5
{3}
Haunted Cloak
Artifact - Equipment
Equipped creature has vigilance, trample, and haste.
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)
{3}
Henge Walker
Artifact Creature - Golem
Adamant -- If at least three mana of the same color was spent to cast this spell, Henge Walker enters the battlefield with a +1/+1 counter on it.
2 /
2
{U}{U}{ // }{2}{U}
Hypnotic Sprite // Mesmeric Glare
Creature - Faerie // Instant - Adventure
Flying
Counter target spell with mana value 3 or less. (Then exile this card. You may cast the creature later from exile.)
2 /
1
{2}{U}
Ichthyomorphosis
Enchantment - Aura
Enchant creature
Enchanted creature loses all abilities and is a blue Fish with base power and toughness 0/1.
--
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}.)
--
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}
Library Larcenist
Creature - Merfolk Rogue
Whenever Library Larcenist attacks, draw a card.
1 /
2
{U}
Mantle of Tides
Artifact - Equipment
Equipped creature gets +1/+2.
Whenever you draw your second card each turn, attach Mantle of Tides to target creature you control.
Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)
{U}
Merfolk Spy
Creature - Merfolk Rogue
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Whenever Merfolk Spy deals combat damage to a player, that player reveals a card at random from their hand.
1 /
1
{1}{U}
Moat Piranhas
Creature - Fish
Defender (This creature can't attack.)
3 /
3
{X}{U}
Multiple Choice
Sorcery
If X is 1, scry 1, then draw a card.
If X is 2, you may choose a player. They return a creature they control to its owner's hand.
If X is 3, create a 4/4 blue and red Elemental creature token.
If X is 4 or more, do all of the above.
{4}
Nevinyrral's Disk
Artifact
Nevinyrral's Disk enters the battlefield tapped.
{1}, {T}: Destroy all artifacts, creatures, and enchantments.
--
Opal Palace
Land
{T}: Add {C}.
{1}, {T}: Add one mana of any color in your commander's color identity. If you spend this mana to cast your commander, it enters the battlefield with a number of additional +1/+1 counters on it equal to the number of times it's been cast from the command zone this game.
{U}
Opt
Instant
Scry 1.
Draw a card.
{5}{U}{U}
Pursued Whale
Creature - Whale
When Pursued Whale enters the battlefield, each opponent creates a 1/1 red Pirate creature token with "This creature can't block" and "Creatures you control attack each combat if able."
Spells your opponents cast that target Pursued Whale cost {3} more to cast.
8 /
8
{2}{U}{ // }{1}{U}
Queen of Ice // Rage of Winter
Creature - Human Noble Wizard // Sorcery - Adventure
Whenever Queen of Ice deals combat damage to a creature, tap that creature. It doesn't untap during its controller's next untap step.
Tap target creature. It doesn't untap during its controller's next untap step. (Then exile this card. You may cast the creature later from exile.)
2 /
3
--
Radiant Fountain
Land
When Radiant Fountain enters the battlefield, you gain 2 life.
{T}: Add {C}.
{1}{U}
Radical Idea
Instant
Draw a card.
Jump-start (You may cast this card from your graveyard by discarding a card in addition to paying its other costs. Then exile this card.)
--
Reliquary Tower
Land
You have no maximum hand size.
{T}: Add {C}.
{2}{U}{U}
Rescuer Sphinx
Creature - Sphinx
Flying
As Rescuer Sphinx enters the battlefield, you may return a nonland permanent you control to its owner's hand. If you do, Rescuer Sphinx enters the battlefield with a +1/+1 counter on it.
3 /
2
{1}{U}
Riptide Turtle
Creature - Turtle
Flash
Defender
0 /
5
{U}
Rishadan Dockhand
Creature - Merfolk
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
{1}, {T}: Tap target land.
1 /
2
{2}{U}
Sage's Row Denizen
Creature - Vedalken Wizard
Whenever another blue creature enters the battlefield under your control, target player mills two cards.
2 /
3
{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}{U}
Seafloor Oracle
Creature - Merfolk Wizard
Whenever a Merfolk you control deals combat damage to a player, draw a card.
2 /
3
{1}{U}
Shaper Apprentice
Creature - Merfolk Wizard
Shaper Apprentice has flying as long as you control another Merfolk.
2 /
1
{1}
Short Sword
Artifact - Equipment
Equipped creature gets +1/+1.
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)
{5}{U}
Skaab Goliath
Creature - Zombie Giant
As an additional cost to cast this spell, exile two creature cards from your graveyard.
Trample
6 /
9
{U}
Sleep of the Dead
Sorcery
Tap target creature. It doesn't untap during its controller's next untap step.
Escape--{2}{U}, Exile three other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)
{U}
So Tiny
Enchantment - Aura
Flash
Enchant creature
Enchanted creature gets -2/-0. It gets -6/-0 instead as long as its controller has seven or more cards in their graveyard.
{1}
Sol Ring
Artifact
{T}: Add {C}{C}.
{6}{U}{U}
Sphinx of the Second Sun
Creature - Sphinx
Flying
At the beginning of your postcombat main phase, there is an additional beginning phase after this phase. (The beginning phase includes the untap, upkeep, and draw steps.)
6 /
6
{5}{U}{U}
Spined Megalodon
Creature - Shark
Hexproof (This creature can't be the target of spells or abilities your opponents control.)
Whenever Spined Megalodon attacks, scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)
5 /
7
{1}{U}
Startling Development
Instant
Until end of turn, target creature becomes a blue Serpent with base power and toughness 4/4.
Cycling {1} ({1}, Discard this card: Draw a card.)
{1}
Team Pennant
Artifact - Equipment
Equipped creature gets +1/+1 and has vigilance and trample.
Equip creature token {1}
Equip {3}
{2}{U}
Thieving Otter
Creature - Otter
Whenever Thieving Otter deals damage to an opponent, draw a card.
2 /
2
{4}{U}{U}
Tolarian Kraken
Creature - Kraken
Whenever you draw a card, you may pay {1}. When you do, you may tap or untap target creature.
4 /
6
{4}{U}{U}
Undersea Invader
Creature - Giant Rogue
Flash
Undersea Invader enters the battlefield tapped.
5 /
6
{3}{U}
Vantress Paladin
Creature - Human Knight
Flying
Adamant -- If at least three blue mana was spent to cast this spell, Vantress Paladin enters the battlefield with a +1/+1 counter on it.
2 /
2
{2}{U}
Vortex Runner
Creature - Human Wizard
As long as you control eight or more lands, Vortex Runner gets +1/+0 and can't be blocked.
2 /
3
{5}{U}{U}
Waker of Waves
Creature - Whale
Creatures your opponents control get -1/-0.
{1}{U}, Discard Waker of Waves: Look at the top two cards of your library. Put one of them into your hand and the other into your graveyard.
7 /
7
{2}{U}
Winged Words
Sorcery
This spell costs {1} less to cast if you control a creature with flying.