, : Target creature with power X or less can't be blocked this turn.

Dominate Monster — When this creature enters, gain control of target creature for as long as you control this creature.

Flying
When this creature dies, target player mills five cards.

Heroic — Whenever you cast a spell that targets this creature, exile the top three cards of target player's library.
, Sacrifice this creature: Counter target spell with the same name as a card exiled with this creature.

Flying
Whenever this creature deals combat damage to an opponent, target player mills four cards.

When this creature enters, empower Jace 4.

Flying
: Target player mills a card. This creature gets +X/+X until end of turn, where X is the milled card's mana value.

Exhaust — , : Draw X cards. Put a +1/+1 counter on each Merfolk creature you control. (Activate each exhaust ability only once.)

At the beginning of your upkeep, surveil 1.
Threshold — As long as there are seven or more cards in your graveyard, creatures your opponents control get -1/-0.

When this creature enters, you get .
, Pay : Target player mills three cards.

Whenever you draw your second card each turn, create a 1/1 blue Illusion creature token with "This token gets +1/+0 for each other Illusion you control."
Whenever an Illusion you control dies, you may put a permanent card with mana value less than or equal to that creature's power from your hand onto the battlefield.

Vigilance
When this creature enters, target player gets two rad counters.
Whenever one or more nonland cards are milled, draw a card, then put a +1/+1 counter on this creature. This ability triggers only once each turn.

Landfall — Whenever a land you control enters, you may have this creature's base power and toughness become 4/2 until end of turn.

Flying
When this creature becomes the target of a spell or ability, return this creature to its owner's hand.

Flying
Whenever you cast an artifact spell, you may untap target creature.

You may have this creature enter as a copy of a creature you control.

Defender
: This creature can attack this turn as though it didn't have defender.

You may have this creature enter as a copy of any creature on the battlefield, except it's a Spirit in addition to its other types.
Disturb

Flying
: This creature's owner shuffles it into their library. If that player does, they reveal cards from the top of that library until a card named Mirror-Mad Phantasm is revealed. The player puts that card onto the battlefield and all other cards revealed this way into their graveyard.

Whenever this creature deals combat damage to a player, draw a card.
Disturb

Flying
Whenever you draw your second card each turn, create a 1/1 blue Faerie creature token with flying.

: Turn this creature face down.
Morph
When this creature is turned face up, copy target instant or sorcery spell. You may choose new targets for that copy.

Flying
Other Merfolk you control get +1/+0 and have flying.
Encore

: This creature gains flying. (This effect lasts indefinitely.)
: This creature loses flying. (This effect lasts indefinitely.)
: This creature phases out.

Devoid
Flying
Ingest

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

Flash
Flying
Champion a Faerie
When a Faerie is championed with this creature, tap all lands target player controls.

Ninjutsu
Whenever this creature deals combat damage to a player, you may return target creature that player controls to its owner's hand.

Sacrifice this creature: Until end of turn, if a nontoken creature would enter and it wasn't cast, exile it instead.

This creature can't be blocked.