This creature enters prepared.
When this creature enters, surveil 1.

Flying
: This creature gains vigilance until end of turn.

Artifacts you control are Clues in addition to their other types and have ", Sacrifice this artifact: Draw a card."
Whenever you sacrifice a Clue, target creature can't be blocked this turn.

Flash
When this creature enters, you may exile target historic permanent you control. If you do, return that card to the battlefield under its owner's control at the beginning of the next end step. (Artifacts, legendaries, and Sagas are historic.)

Flash
Flying

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

Flying
At the beginning of your upkeep, sacrifice a land. If you sacrifice an Island this way, this creature deals 3 damage to you.
When you control no lands, sacrifice this creature.

Flying
At the beginning of your upkeep, this creature deals 1 damage to you.

: Target creature other than this creature has base power and toughness 0/2 until end of turn.

If there are three or more Lesson cards in your graveyard, you may cast this spell as though it had flash.
This spell costs less to cast for each noncreature, nonland card in your graveyard.

Flying, vigilance

Flying
When this creature dies, each player discards a card.

Flying
Whenever you cast a noncreature spell, put an oil counter on this creature.
, Remove an oil counter from this creature: Draw a card, then scry 2.

When this creature enters, draw a card, then scry 2.

: This creature can't be blocked this turn. This ability costs less to activate if there are five or more mana values among cards in your graveyard.

Whenever you cast your second spell each turn, choose target creature an opponent controls. If it's tapped, put a stun counter on it. Otherwise, tap it.

Flying
This creature can block only creatures with flying.
Tap two untapped Spirits you control: Tap target creature you don't control.

Flash
At the beginning of your upkeep, each player mills three cards. You may exile a creature card from among the cards milled this way. If you do, this creature becomes a copy of that card, except it has this ability.

Flying, ward
When this creature enters, create two 1/1 black Faerie Rogue creature tokens with flying.
Whenever a creature you control with flying attacks, you may have it become a red Dragon with base power and toughness 4/4 in addition to its other colors and types until end of turn.

All Sliver creatures have shadow.

Whenever this creature blocks or becomes blocked by a creature, change this creature's base power and toughness to that creature's power and toughness until end of turn.

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

, : Target creature gains first strike until end of turn.
, : Target creature gets +1/+0 until end of turn.

Morph
When this creature is turned face up, target creature gets +2/-2 or -2/+2 until end of turn.

Changeling
: Target Shapeshifter becomes a copy of target creature until your next turn.

Whenever Shellfish Scholar or another Rat you control enters, conjure a card named Think Twice into your graveyard.
Threshold — : Spells you cast from your graveyard this turn cost less to cast. Activate only if seven or more cards are in your graveyard.

Flying
, : Return another target permanent you control to its owner's hand. Activate only during your turn.

When this creature enters, put a shield counter on target noncommander creature you don't control. You gain control of that creature for as long as it has a shield counter on it.

Flash
Whenever this creature blocks, you get .
, Pay : Draw a card.

Slivers can't be blocked except by Slivers.