msem-instigator

Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)
Heroic — Whenever you cast a spell that targets Aegis Hero, put a +1/+1 counter on Aegis Hero.

First strike, menace
Melee (Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked this combat.)
At the beginning of each combat, you may pay {1}. When you do, another target creature gains melee until end of turn. (If a creature has multiple instances of melee, each triggers separately.)

{1}{U}: Aeon's Hand Cutthroat can't be blocked this turn.

Aeren Hellfire deals 4 damage to any target.
You may draw a card. If you do, discard a card.

Flying, double strike

Flying
As long as Aerial Tactician is tapped, Soldiers you control get +0/+1.
As long as Aerial Tactician is untapped, Soldiers you control get +1/+0.

Flying
At the beginning of your end step, untap another target creature you control.

Create two 1/1 white Bird creature tokens with flying.

When Aerie Bell-Warden enters, if it's in a pack, you gain 5 life. (Two or more creatures you control with equal power are in a pack.)

Flying, first strike

Enchant creature
When Aerie Watch enters, draw a card.
Enchanted creature gets +1/+1 and has reach.

Flying
{2/U}{2/U}: Exile Aeriform Remnant. Return it to the battlefield under its owner's control at the beginning of the next end step.

Aeroblast deals 5 damage to target attacking or blocking creature.

Spells you cast from anywhere other than your hand cost {1} less to cast.
Whenever an opponent casts a spell with the same name as a card they own in exile or in their graveyard, that player loses 1 life and you gain 1 life.

Flying
Whenever Aether Crosser attacks, you may aetherize another target tapped creature you control. (To aetherize, create a token that's a copy of it, then exile that token.)
Crew 1

{T}, Sacrifice Aether Gateway: Create a tapped Plains token, Island token, Swamp token, Mountain token, or Forest token.

Vision (Whenever this or another creature you control enters, reveal the top card of your library. Then you may put that card into your graveyard.)
Whenever Aether Recoverer envisions a creature card, return target noncreature card from your graveyard to your hand.

When Aether Road Caravan enters, gain control of target nonland permanent with mana value 3 or less for as long as you control Aether Road Caravan.

Counter target spell unless its controller pays {3}. Its controller mills three cards.

When Aether Sculptor enters, create a tapped colorless artifact token named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”

Return up to two target permanents to their owners' hands.

Return target permanent you control and target permanent you don't control to their owners' hands.

Create a token that's a copy of target artifact or enchantment you control.

Counter target spell unless its controller pays {1}.
Create a colorless artifact token named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”

Return target nonland permanent to its owner's hand. You get a glory counter. (You lose glory counters before life. A player with ten or more glory counters wins the game.)