msem-instigator

Kicker {U} (You may pay an additional {U} as you cast this spell.)
Flying
If Aven Ranger was kicked, it enters with a +1/+1 counter on it.

Flying
Civilized — Whenever Aven Supervisor deals combat damage to a player, if you control an artifact, a creature, and an enchantment, you may draw a card. If you do, discard a card.

Eureka! (At the beginning of each end step, you get a research counter if you cast a spell this turn. Then if you have eight or more research counters, remove them and create a Masterpiece token of your choice.)
{T}: Draw a card, then discard a card.

(Add a quest counter as this enters. Sacrifice after 6.)
Whenever you cast an instant or sorcery spell from your hand, add a quest counter.
Exile target instant or sorcery spell you control instead of putting it into your graveyard as it resolves. You may cast that card from exile until Awaken the SOURCE leaves the battlefield.
Exile target instant or sorcery spell you control as it resolves. Until end of turn, you may cast cards exiled with Awaken the SOURCE without paying their mana costs.
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Look at the top three cards of your library. You may put any number of them into your graveyard. Draw a card.

Enchant creature
When Awash in Despair enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

When Azure Archaeologist enters, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)
{2}, {T}, Sacrifice a Clue: Draw two cards, then discard a card.

Draw X cards, where X is the number of differently named lands you control.

When Azutahn Hydromancer enters, you may return target creature with power X or less to its owner's hand, where X is the number of differently named lands you control.

Whenever Babbling Experiment or another creature you control enters, target player mills two cards.

Backstabbing Courtiers can't attack unless you foretold a card or cast a foretold spell this turn.

Target creature gets +1/+0 and can't be blocked this turn.
Showcase {2}{U} (Then if you cast this for its showcase cost, create a 1/1 red Bard creature token that can't block and exile this. Whenever it attacks, you may cast a free copy of this.)

This spell costs {U} less to cast if you dealt combat damage to a player this turn with a Rogue.
Flying
When Balloon Voyager enters, draw a card.

Counter target planeswalker spell.
Draw a card.

When Banished Prophet enters, you may remove a counter from a permanent you control. If you do, put a +1/+1 counter on another target creature you control.

Defender (This creature can't attack.)
Discard a card: Barge Engulfer can attack as though it didn't have defender until end of turn.

Vanguard — Whenever a creature you control attacks alone, it gets +1/+3 until end of turn.

Target creature you control gets +0/+3 and gains hexproof until end of turn.

{1}{U}: Target creature you control can't be blocked this turn by creatures with less power.
{1}{U}: Target creature you control can't be blocked this turn by creatures with greater power.

Flying
Chosen one ({W}{U}{B}{R}{G}: Transform this permanent.)

Creatures you control have “{T}: Add {C}.”
Mirage {1}{U} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

Enchant creature
Enchanted creature gets -2/-0.
{3}{U}{U}: Submerge enchanted creature. (To submerge a card, exile it, then put it on the battlefield face down under its owner's control as a 2/2 creature.)

When Battlemage's Disruption enters, you may return target creature to its owner's hand.
{3}{U}, Sacrifice Battlemage's Disruption: Return target creature to its owner's hand.

(Transform this if it's not attached to a creature. Pay {1}{U} as a sorcery to unattach it.)
Enchant creature you control
Bay-Bandit's Snapper's rider gets +1/+2.
Whenever Bay-Bandit's Snapper's rider deals combat damage to a player, you draw two cards.

Whenever Bazaar Informant deals combat damage to a player, reveal the top card of that player's library. If it's a nonland card, put a +1/+1 counter on Bazaar Informant, then that player puts that card into their graveyard.