msem-instigator

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Converge — Admin of Asthenia enters with a +1/+1 counter on it for each color of mana spent to cast it.
Admin of Asthenia can't attack unless its power is 4 or greater.

Whenever you cast a noncreature spell, put a +1/+1 counter on Adrift Surveyor.
Surpass {5}{U} ({5}{U}: Transform this creature. This costs {1} less to activate for each counter on it. Activate only as a sorcery.)

Noncreature spells you cast cost {1} less to cast.

Choose one —
• Create three X/X colorless Construct artifact creature tokens.
• Create X tokens that are copies of target artifact you control.

Flying
As long as there are five or more different creature types among creatures you control, Adventuring Guildmage gets +1/+0 and has hexproof.

Flash
Enchant creature
When Aegis Expertise enters, untap enchanted creature.
Enchanted creature gets +0/+3.

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

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

({T}: Add {U}.)
Aerie's Pillar enters tapped.
Flying
{2}{U}{U}: Aerie's Pillar becomes a creature in addition to its other types until end of turn.

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.

Flying
Your opponents play with their hands revealed.
If an opponent would search their library for a card, you may have that player search their hand for that card instead.

Flash
When you cast Aether Ascendant, you may have it become a copy of target instant or sorcery spell. If you do, choose new targets for it. (It won't enter.)

If a creature entering the battlefield under your control causes a triggered ability of that creature to trigger, you may exile it. If you do, that ability triggers an additional time.

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.

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.”

Shuffle your library, then exile cards from the top until you exile an artifact card. You may put that card into your hand. Shuffle the rest back into your library.

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.)

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

Whenever you make first contact, you may draw a card. If you do, put a card from your hand on the bottom of your library. (You make first contact the first time each turn you cast a spell with a name not in your graveyard or control already.)

Flash
Enchant permanent or spell
Whenever enchanted permanent or spell deals damage to a creature, return that creature to its owner's hand (if it's still on the battlefield).

When Aetherite Vein enters, scry 1.
{U}, Sacrifice Aetherite Vein: Return target creature to its owner's hand.