Tidal Courier

When Tidal Courier comes into play, reveal the top four cards of your library. Put all merfolk cards revealed this way into your hand and the rest on the bottom of the library. {3}{U}: Tidal Courier gains flying until end of turn.

Wake Thrasher

Whenever a permanent you control becomes untapped, Wake Thrasher gets +1/+1 until end of turn.

Aquitect's Will

Put a flood counter on target land. That land is an Island in addition to its other types as long as it has a flood counter on it. If you control a Merfolk, draw a card.

Inkfathom Divers

Islandwalk When Inkfathom Divers comes into play, look at the top four cards of your library, then put them back in any order.

Streambed Aquitects

{T}: Target Merfolk creature gets +1/+1 and gains islandwalk until end of turn. {T}: Target land becomes an Island until end of turn.

Merfolk Sovereign

Other Merfolk creatures you control get +1/+1. {T}: Target Merfolk creature is unblockable this turn.

Master of the Pearl Trident

Other Merfolk creatures you control get +1/+1 and have islandwalk. (They are unblockable as long as defending player controls an Island.)

Tidebinder Mage

When Tidebinder Mage enters the battlefield, tap target red or green creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control Tidebinder Mage.

Claustrophobia

Enchant creature When Claustrophobia enters the battlefield, tap enchanted creature.Enchanted creature doesn't untap during its controller's untap step.

Harbinger of the Tides

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.

Misdirection

You may remove a blue card in your hand from the game instead of paying Misdirection's mana cost. Target spell with a single target targets another target instead.

Tidal Wave

Put a Wave token into play. Treat this token as a 5/5 blue creature that counts as a Wall. Bury the token at end of any turn.

Mind Spring

Draw X cards.

Lonely Sandbar

Lonely Sandbar comes into play tapped. {T}: Add {U} to your mana pool. Cycling {U} ({U}, Discard this card from your hand: Draw a card.)

Concentrate

Draw three cards.

Merrow Reejerey

Other Merfolk creatures you control get +1/+1. Whenever you play a Merfolk spell, you may tap or untap target permanent.

Tidal Warrior

{T}: Target land is an island until end of turn.

Rootwater Hunter

{T}: Rootwater Hunter deals 1 damage to target creature or player.

Merfolk Looter

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

Master of Waves

Protection from red Elemental creatures you control get +1/+1. When Master of Waves enters the battlefield, put a number of 1/0 blue Elemental creature tokens onto the battlefield equal to your devotion to blue. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.)

Triton Tactics

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.

Scroll Thief

Whenever Scroll Thief deals combat damage to a player, draw a card.

Merfolk Wayfinder

Flying When Merfolk Wayfinder enters the battlefield, reveal the top three cards of your library. Put all Island cards revealed this way into your hand and the rest on the bottom of your library in any order.

Blighted Cataract

Cold-Eyed Selkie

Engulf the Shore

Essence Scatter

Counter target creature spell.