Counterspell

Aarakocra Sneak

Flying
When Aarakocra Sneak enters, you take the initiative.

Archfiend of Ifnir

Flying
Whenever you cycle or discard another card, put a -1/-1 counter on each creature your opponents control.
Cycling {2} ({2}, Discard this card: Draw a card.)

Aquamoeba

Discard a card: Switch Aquamoeba's power and toughness until end of turn.

Artificer's Assistant

Flying
Whenever you cast a historic spell, scry 1. (Artifacts, legendaries, and Sagas are historic. To scry 1, look at the top card of your library, then you may put that card on the bottom.)

Aquus Steed

{2}{U}, {T}: Target creature gets -2/-0 until end of turn.

Apocalypse Demon

Flying
Apocalypse Demon's power and toughness are each equal to the number of cards in your graveyard.
At the beginning of your upkeep, tap Apocalypse Demon unless you sacrifice another creature.

Abyssal Horror

Flying
When Abyssal Horror enters, target player discards two cards.

Aesthir Glider

Falthis, Shadowcat Familiar

Commanders you control have menace and deathtouch.
Partner (You can have two commanders if both have partner.)

Anvilwrought Raptor

Flying
First strike (This creature deals combat damage before creatures without first strike.)

Hakka, Whispering Raven

Flying
Whenever Hakka, Whispering Raven deals combat damage to a player, return it to its owner's hand, then scry 2.

Alrund, God of the Cosmos

Alrund gets +1/+1 for each card in your hand and each foretold card you own in exile.
At the beginning of your end step, choose a card type, then reveal the top two cards of your library. Put all cards of the chosen type revealed this way into your hand and the rest on the bottom of your library in any order.

Alrund, God of the Cosmos // Hakka, Whispering Raven

Aeromoeba

Flying
Discard a card: Switch Aeromoeba's power and toughness until end of turn.

Angel of Suffering

Flying
If damage would be dealt to you, prevent that damage and mill twice that many cards.

Abyssal Persecutor

Flying, trample
You can't win the game and your opponents can't lose the game.

Archfiend of Depravity

Flying
At the beginning of each opponent's end step, that player chooses up to two creatures they control, then sacrifices the rest.

Aphetto Vulture

Flying
When Aphetto Vulture dies, you may put target Zombie card from your graveyard on top of your library.

Archdemon of Paliano

Draft Archdemon of Paliano face up.
As long as Archdemon of Paliano is face up during the draft, you can't look at booster packs and must draft cards at random. After you draft three cards this way, turn Archdemon of Paliano face down. (You may look at cards as you draft them.)
Flying

Abyssal Nocturnus

Whenever an opponent discards a card, Abyssal Nocturnus gets +2/+2 and gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)