Rootwater Commando

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

Merfolk Traders

When this creature enters, draw a card, then discard a card.

Jungle Delver

{3}{G}: Put a +1/+1 counter on this creature.

Vodalian Knights

First strike
This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.
{U}: This creature gains flying until end of turn.

Halimar Wavewatch

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.)

Sandbar Merfolk

Cycling {2} ({2}, Discard this card: Draw a card.)

Merfolk of the Pearl Trident

Inkfathom Divers

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
When this creature enters, look at the top four cards of your library, then put them back in any order.

Expedition Diviner

Flying
As long as you control another Wizard, this creature has "When this creature dies, draw a card."

Nyxborn Triton

Bestow {4}{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.)
Enchanted creature gets +2/+3.

Gaea's Skyfolk

Vodalian Merchant

Saltwater Stalwart

Whenever this creature deals damage to an opponent, target player draws a card.

Deeproot Warrior

Whenever this creature becomes blocked, it gets +1/+1 until end of turn.

Manta Riders

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

Umara Entangler

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

Waterspout Weavers

Kinship — At the beginning of your upkeep, you may look at the top card of your library. If it shares a creature type with this creature, you may reveal it. If you do, each creature you control gains flying until end of turn.

Wilderness Hypnotist

{T}: Target red or green creature gets -2/-0 until end of turn.

Skywatcher Adept

Level up {3} ({3}: Put a level counter on this. Level up only as a sorcery.)
LEVEL 1-2
2/2
Flying
LEVEL 3+
4/2
Flying

Riptide Pilferer

Whenever this creature deals combat damage to a player, that player discards a card.
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.)

Selkie Hedge-Mage

When this creature enters, if you control two or more Forests, you may gain 3 life.
When this creature enters, if you control two or more Islands, you may return target tapped creature to its owner's hand.

Coral Fighters

Whenever this creature attacks and isn't blocked, look at the top card of defending player's library. You may put that card on the bottom of that player's library.

Merrow Levitator

{T}: Target creature gains flying until end of turn.
Whenever you cast a blue spell, you may untap this creature.

Jadecraft Artisan

When this creature enters, target creature gets +2/+2 until end of turn.

Blockade Runner

{U}: This creature can't be blocked this turn.

Giltgrove Stalker

This creature can't be blocked by creatures with power 2 or less.

Shaper Apprentice

This creature has flying as long as you control another Merfolk.

Svyelunite Priest

{U}{U}, {T}: Target creature gains shroud until end of turn. Activate only during your upkeep. (It can't be the target of spells or abilities.)

Jade Guardian

Hexproof (This creature can't be the target of spells or abilities your opponents control.)
When this creature enters, put a +1/+1 counter on target Merfolk you control.

Soothsayer Adept

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

River Merfolk

{U}: This creature gains mountainwalk until end of turn. (It can't be blocked as long as defending player controls a Mountain.)