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.
{1}{U}
Arcane Denial
Instant
Counter target spell. Its controller may draw up to two cards at the beginning of the next turn's upkeep.
You draw a card at the beginning of the next turn's upkeep.
{1}{U}
Augur of Bolas
Creature - Merfolk Wizard
When Augur of Bolas enters the battlefield, look at the top three cards of your library. You may reveal an instant or sorcery card from among them and put it into your hand. Put the rest on the bottom of your library in any order.
1 /
3
{2}{U}
Befuddle
Instant
Target creature gets -4/-0 until end of turn.
Draw a card.
{3}{U}
Behold the Multiverse
Instant
Scry 2, then draw two cards.
Foretell {1}{U} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)
{2}{U}
Bewilder
Instant
Target creature gets -3/-0 until end of turn.
Draw a card.
{1}{G}
Big Play
Instant
Target creature gets +2/+2 and gains reach until end of turn. Put a +1/+1 counter on it.
{2}{U}
Blur
Instant
Exile target creature you control, then return that card to the battlefield under its owner's control.
Draw a card.
{2}{U}{U}
Bone to Ash
Instant
Counter target creature spell.
Draw a card.
--
Brokers Hideout
Land
When Brokers Hideout enters the battlefield, sacrifice it. When you do, search your library for a basic Forest, Plains, or Island card, put it onto the battlefield tapped, then shuffle and you gain 1 life.
{U}
Caller of Gales
Creature - Merfolk Wizard
{1}{U}, {T}: Target creature gains flying until end of turn.
1 /
1
{1}{U}{U}
Cancel
Instant
Counter target spell.
{3}{U}
Case the Joint
Instant
Draw two cards, then look at the top card of each player's library.
{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
{U}
Clutch of Currents
Sorcery
Return target creature to its owner's hand.
Awaken 3--{4}{U} (If you cast this spell for {4}{U}, also put three +1/+1 counters on target land you control and it becomes a 0/0 Elemental creature with haste. It's still a land.)
{3}{U}
Contact Other Plane
Instant
Roll a d20.
1--9 | Draw two cards.
10--19 | Scry 2, then draw two cards.
20 | Scry 3, then draw three cards.
{2}{U}
Crashing Tide
Sorcery
This spell has flash as long as you control a Merfolk.
Return target creature to its owner's hand.
Draw a card.
{3}{G}
Dawn's Reflection
Enchantment - Aura
Enchant land
Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors.
{1}{G}
Deeproot Warrior
Creature - Merfolk Warrior
Whenever Deeproot Warrior becomes blocked, it gets +1/+1 until end of turn.
2 /
2
{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
{1}{U}
Deliberate
Instant
Scry 2, then draw a card.
{2}{U}
Divination
Sorcery
Draw two cards.
{2}{U}
Enclave Elite
Creature - Merfolk Soldier
Multikicker {1}{U} (You may pay an additional {1}{U} any number of times as you cast this spell.)
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Enclave Elite enters the battlefield with a +1/+1 counter on it for each time it was kicked.
2 /
2
{2}{G}{U}
Eureka Moment
Instant
Draw two cards. You may put a land card from your hand onto the battlefield.
{1}{G}
Explore
Sorcery
You may play an additional land this turn.
Draw a card.
{1}
Explorer's Scope
Artifact - Equipment
Whenever equipped creature attacks, look at the top card of your library. If it's a land card, you may put it onto the battlefield tapped.
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)
{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.)
{U}{U}
Flood of Recollection
Sorcery
Return target instant or sorcery card from your graveyard to your hand. Exile Flood of Recollection.
--
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}.)
--
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}.)
--
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}.)
--
Forest
Basic Land - Forest
({T}: Add {G}.)
{1}{G}
Giltgrove Stalker
Creature - Merfolk Warrior
Giltgrove Stalker can't be blocked by creatures with power 2 or less.
2 /
1
{1}{U}
Goggles of Night
Artifact - Equipment
Whenever equipped creature deals combat damage to a player, 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.)
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)
{1}{U}
Gray Harbor Merfolk
Creature - Merfolk Rogue
Gray Harbor Merfolk can't be blocked.
Gray Harbor Merfolk gets +2/+0 as long as you control a commander that's a creature or planeswalker.
0 /
3
{2}{G}
Grow from the Ashes
Sorcery
Kicker {2} (You may pay an additional {2} as you cast this spell.)
Search your library for a basic land card, put it onto the battlefield, then shuffle. If this spell was kicked, instead search your library for two basic land cards, put them onto the battlefield, then shuffle.
{1}{U}
Halimar Wavewatch
Creature - Merfolk Soldier
Level up {2} ({2}: Put a level counter on this. Level up only as a sorcery.)
LEVEL 1-4
0/6
LEVEL 5+
6/6
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
0 /
3
{1}{G}
Haze of Pollen
Instant
Prevent all combat damage that would be dealt this turn.
Cycling {3} ({3}, Discard this card: Draw a card.)
{3}{U}{U}
Inkfathom Divers
Creature - Merfolk Soldier
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
When Inkfathom Divers enters the battlefield, look at the top four cards of your library, then put them back in any order.
3 /
3
--
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}.)
{G}
Jade Bearer
Creature - Merfolk Shaman
When Jade Bearer enters the battlefield, put a +1/+1 counter on another target Merfolk you control.
1 /
1
{3}{G}
Jade Guardian
Creature - Merfolk Shaman
Hexproof (This creature can't be the target of spells or abilities your opponents control.)
When Jade Guardian enters the battlefield, put a +1/+1 counter on target Merfolk you control.
2 /
2
{G}
Jungle Delver
Creature - Merfolk Warrior
{3}{G}: Put a +1/+1 counter on Jungle Delver.
1 /
1
{2}{G}
Jungleborn Pioneer
Creature - Merfolk Scout
When Jungleborn Pioneer enters the battlefield, create a 1/1 blue Merfolk creature token with hexproof. (It can't be the target of spells or abilities your opponents control.)
2 /
2
{2}{G}
Lace with Moonglove
Instant
Target creature gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy that creature.)
Draw a card.
{2}{U}
Library Larcenist
Creature - Merfolk Rogue
Whenever Library Larcenist attacks, draw a card.
1 /
2
{1}{G}
Lull
Instant
Prevent all combat damage that would be dealt this turn.
Cycling {2} ({2}, Discard this card: Draw a card.)
{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.
{G}{U}
Merfolk Mistbinder
Creature - Merfolk Shaman
Other Merfolk you control get +1/+1.
2 /
2
{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
{2}{U}
Merfolk Thaumaturgist
Creature - Merfolk Wizard
{T}: Switch target creature's power and toughness until end of turn.
1 /
2
{U}
Mist-Cloaked Herald
Creature - Merfolk Warrior
Mist-Cloaked Herald can't be blocked.
1 /
1
{2}{U}
Moonbow Illusionist
Creature - Moonfolk Wizard
Flying
{2}, Return a land you control to its owner's hand: Target land becomes the basic land type of your choice until end of turn.
2 /
1
{2}
Moss Diamond
Artifact
Moss Diamond enters the battlefield tapped.
{T}: Add {G}.
{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.
{1}{U}
Peel from Reality
Instant
Return target creature you control and target creature you don't control to their owners' hands.
{U}
Piracy Charm
Instant
Choose one --
• Target creature gains islandwalk until end of turn. (It can't be blocked as long as defending player controls an Island.)
• Target creature gets +2/-1 until end of turn.
• Target player discards a card.
{1}{G/U}{G/U}
Quandrix Pledgemage
Creature - Merfolk Druid
Magecraft -- Whenever you cast or copy an instant or sorcery spell, put a +1/+1 counter on Quandrix Pledgemage.
2 /
2
{G}
Reclaim the Wastes
Sorcery
Kicker {3} (You may pay an additional {3} as you cast this spell.)
Search your library for a basic land card, reveal it, put it into your hand, then shuffle. If this spell was kicked, search your library for two basic land cards instead of one.
{U}
Reef Shaman
Creature - Merfolk Shaman
{T}: Target land becomes the basic land type of your choice until end of turn.
0 /
2
{1}{G}
River Heralds' Boon
Instant
Put a +1/+1 counter on target creature and a +1/+1 counter on up to one target Merfolk.
{2}{U}
Rootwater Commando
Creature - Merfolk
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
2 /
2
{3}{U}
Saltwater Stalwart
Creature - Merfolk Warrior
Whenever Saltwater Stalwart deals damage to an opponent, target player draws a card.
2 /
4
{2}{G}
Scale the Heights
Sorcery
Put a +1/+1 counter on up to one target creature. You gain 2 life. You may play an additional land this turn.
Draw a card.
{2}{U}
Scroll Thief
Creature - Merfolk Rogue
Whenever Scroll Thief deals combat damage to a player, draw a card.
1 /
3
{1}{U}
Shaper Apprentice
Creature - Merfolk Wizard
Shaper Apprentice has flying as long as you control another Merfolk.
2 /
1
{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}{U}
Storm Sculptor
Creature - Merfolk Wizard
Storm Sculptor can't be blocked.
When Storm Sculptor enters the battlefield, return a creature you control to its owner's hand.
3 /
2
{1}{U}{U}
Streambed Aquitects
Creature - Merfolk Scout
{T}: Target Merfolk creature gets +1/+1 and gains islandwalk until end of turn. (It can't be blocked as long as defending player controls an Island.)
{T}: Target land becomes an Island until end of turn.
2 /
3
--
Tangled Islet
Land - Forest Island
({T}: Add {G} or {U}.)
Tangled Islet enters the battlefield tapped.
{U}
Tidal Warrior
Creature - Merfolk Warrior
{T}: Target land becomes an Island until end of turn.
1 /
1
--
Merfolk
Token Creature - Merfolk
Blue
Hexproof (This creature can't be the target of spells or abilities your opponents control.)