Lorwyn

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

Islandwalk (This creature can't be blocked as long as defending player controls an Island.) When Merrow Harbinger enters the battlefield, you may ...

Changeling (This card is every creature type.) {1}{U}: Switch Turtleshell Changeling's power and toughness until end of turn.

Changeling (This card is every creature type.) Champion a creature (When this enters the battlefield, sacrifice it unless you exile another creatur...

As an additional cost to cast this spell, reveal a Merfolk card from your hand or pay {3}. When Silvergill Adept enters the battlefield, draw a card.

Counter target spell. Clash with an opponent. If you win, at the beginning of your next main phase, you may add an amount of {C} equal to that spel...

At the beginning of your end step, untap all Merfolk you control.

Protection from red Sacrifice Burrenton Forge-Tender: Prevent all damage a red source of your choice would deal this turn.

Flying Whenever you cast a spell during an opponent's turn, you may return target creature you control to its owner's hand.

As an additional cost to cast this spell, return a creature you control to its owner's hand. Counter target spell.

Whenever Fallowsage becomes tapped, you may draw a card.

Flash Flying When Faerie Harbinger enters the battlefield, you may search your library for a Faerie card, reveal it, then shuffle and put that card...

Flying Ethereal Whiskergill can't attack unless defending player controls an Island.

Changeling (This card is every creature type.) Creatures target player controls get -2/-0 and lose all creature types until end of turn.

Tap an untapped Merfolk you control: Target player mills a card.

Enchant creature At the beginning of your end step, clash with an opponent. If you win, gain control of enchanted creature. Otherwise, that player ...

When Benthicore enters the battlefield, create two 1/1 blue Merfolk Wizard creature tokens. Tap two untapped Merfolk you control: Untap Benthicore...

Enchant creature Enchanted creature has double strike. (It deals both first-strike and regular combat damage.)

Other Kithkin creatures you control get +1/+1.

Whenever Veteran of the Depths becomes tapped, you may put a +1/+1 counter on it.

Create two 1/1 blue Merfolk Wizard creature tokens. Tap four untapped Merfolk you control: Return Summon the School from your graveyard to your hand.

Defender At the beginning of combat on your turn, you may clash with an opponent. If you win, Sentry Oak gets +2/+0 and loses defender until end of...

Prevent all combat damage that would be dealt this turn. Clash with an opponent. If you win, creatures that player controls don't untap during the ...

First strike Lifelink (Damage dealt by this creature also causes you to gain that much life.)