Draw three cards. Proliferate.

You may have this creature enter as a copy of any creature on the battlefield, except if this creature was embalmed, the token has no mana cost, it's white, and it's a Zombie in addition to its other types.
Embalm

When this creature enters, you may search your library for a creature card with eternalize or embalm, put that card into your graveyard, then shuffle.
Whenever you activate an eternalize or embalm ability, draw a card.

: Untap another target permanent.
Cycling
When you cycle this card, untap target permanent.

Start your engines!
You have no maximum hand size.
Max speed — If you would draw a card, draw two cards instead.

Domain — When this creature enters, look at the top X cards of your library, where X is the number of basic land types among lands you control. You may put one of those cards on top of your library. Put the rest on the bottom of your library in a random order.

: Add . Spend this mana only to cast an instant or sorcery spell.

Flash
Other Merfolk you control get +1/+1.
Sacrifice a Merfolk: Counter target noncreature spell unless its controller pays .

, : Target player discards a card. Activate only as a sorcery.

, : Target creature phases out.

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

, : Counter target spell unless its controller pays .

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

Kicker and/or
This creature enters with two +1/+1 counters on it for each time it was kicked.
When this creature enters, gain control of target creature with power less than this creature's power for as long as you control this creature.

: Target instant or sorcery spell becomes the color of your choice.

Kicker
This creature can't attack unless defending player controls an Island.
If this creature was kicked, it enters with four +1/+1 counters on it.

Defender
Tap an untapped Merfolk you control: This creature can attack this turn as though it didn't have defender.
Tap an untapped Merfolk you control: This creature gets +2/+1 until end of turn.
When this creature dies, destroy all Merfolk tapped this turn to pay for its abilities.

Devoid
Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Return target nonland permanent to its owner's hand.

Return target nonland permanent to its owner's hand.
Rebound

, : Put this creature and target creature on top of their owners' libraries, then those players shuffle their libraries.

Morph
When this creature is turned face up, counter target spell.

Flash
When this creature enters, counter target activated ability. (Mana abilities can't be targeted.)
Whenever you cast a spell, you may return this creature to its owner's hand.

, Sacrifice a Wizard: Counter target spell.
Morph

Exile target creature. Return it to the battlefield under its owner's control at the beginning of the next end step.
Cipher

When this creature enters, you may return target creature to its owner's hand.

Flying, hexproof from activated and triggered abilities
When this creature enters, exchange control of this creature and target creature an opponent controls. If you do, you get , then sacrifice that creature unless you pay an amount of equal to its mana value.

Enchant permanent
When this Aura enters, if enchanted permanent is tapped, untap it.
You control enchanted permanent.