The Hobbit Eternal

Creature — Whale

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Whenever this creature attacks, you may exile target creature defending player controls until this creature leaves the battlefield. (That creature returns under its owner's control.)

Colossal Whale

Final Fantasy Commander Tokens

Chasm Skulker

Coral Barrier

Token Creature — Squid

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

Squid

Assassin's Creed

Legendary Artifact — Vehicle

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Whenever Adrestia attacks, if an Assassin crewed it this turn, draw a card. Adrestia becomes an Assassin in addition to its other types until end of turn.
Crew 1

Adrestia

Outlaws of Thunder Junction Commander

Creature — Merfolk Rogue

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Whenever this creature deals combat damage to a player, you may draw that many cards.

Cold-Eyed Selkie

The Lost Caverns of Ixalan Commander

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.

Stonybrook Banneret

Doctor Who Tokens

The Sea Devils

Alien Salamander

Token Creature — Alien Salamander

Doctor Who

Creature — Alien Zombie Horror

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Water Always Wins — Whenever this creature attacks, put a flood counter on another target creature or land. If it's a creature, it becomes a copy of this creature. If it's a land, it becomes an Island in addition to its other types.

The Flood of Mars

Unknown Event

Legendary Creature — Cat Gamer

Islandwalk, swampwalk (This creature can't be blocked if defending player controls an Island or a Swamp)
Whenever The Milling Runner deals combat damage to a player, target player mills three cards.
Ready to run (You can have two commanders if both have ready to run.)

The Milling Runner

New Capenna Commander

Legendary Creature — Kraken

Islandwalk, swampwalk (This creature can't be blocked as long as defending player controls an Island or a Swamp.)
Whenever Wrexial deals combat damage to a player, you may cast target instant or sorcery card from that player's graveyard without paying its mana cost. If that spell would be put into a graveyard, exile it instead.

Wrexial, the Risen Deep

Modern Horizons 2 Promos

Creature — Merfolk

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
{1}, {T}: Tap target land.

Rishadan Dockhand

Commander Legends

Creature — Leviathan

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
All lands are Islands in addition to their other types.
Creatures without flying or islandwalk can't attack.

Stormtide Leviathan

The List

Creature — Merfolk Soldier

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.

Inkfathom Divers

Creature — Merfolk Scout

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
{2}{U}: Tap target creature without flying.

Merfolk Seastalkers

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.)

Halimar Wavewatch

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
When this creature enters, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top.

Merrow Harbinger

Creature — Turtle

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Whenever this creature attacks, exile it. Return it to the battlefield under your control tapped and attacking at the beginning of the declare attackers step on your next turn.

Meandering Towershell

Creature — Snake

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
{G}: Regenerate this creature.

River Boa

Creature — Bear

River Bear

Double Masters

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.)

Inkwell Leviathan

Secret Lair Drop

Creature — Crocodile

Bloodthirst 1 (If an opponent was dealt damage this turn, this creature enters with a +1/+1 counter on it.)
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Lurking Crocodile

Conspiracy

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.)
This creature enters with a +1/+1 counter on it for each time it was kicked.

Enclave Elite

Magic 2014

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Whenever this creature deals combat damage to a player, that player reveals a card at random from their hand.

Merfolk Spy

Magic 2013

Creature — Serpent

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
This creature can't attack unless there are five or more Islands on the battlefield.

Harbor Serpent

Worldwake

Legendary Creature — Merfolk Rogue

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Whenever Thada Adel deals combat damage to a player, search that player's library for an artifact card and exile it. Then that player shuffles. Until end of turn, you may play that card.

Thada Adel, Acquisitor

Lorwyn

Legendary Creature — Merfolk Wizard

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
{1}{W}: Target Merfolk you control gains protection from the color of your choice until end of turn.

Sygg, River Guide

Tenth Edition

Rootwater Commando

Ravnica: City of Guilds

Grayscaled Gharial

Seventh Edition

Benthic Behemoth

Creature — Hippo

Bull Hippo

Mercadian Masques

Creature — Squid Beast

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
You may choose not to untap this creature during your untap step.
{T}: Tap target creature. That creature doesn't untap during its controller's untap step for as long as this creature remains tapped.

Sand Squid

Portal Three Kingdoms

Creature — Horse

Zodiac Horse

Classic Sixth Edition

Segovian Leviathan

Mirage

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.)

Merfolk Raiders

Creature — Djinn

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
At the beginning of your upkeep, you lose 2 life.

Benthic Djinn

Ice Age

Pale Bears

Fallen Empires

Creature — Goblin

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)
At the beginning of each combat, unless you pay {R}, whenever this creature blocks or becomes blocked by a creature this combat, that creature gains first strike until end of turn.