msem-instigator

Choose target creature you control. Double its power and toughness until end of turn. That creature deals X damage divided as you choose among any number of target creatures and/or planeswalkers your opponents control, where X is its power.

Flying
Whenever you cast a spell, create a 1/1 blue Boar Dragon creature token with flying.

Flying
When Cloudchaser Kestrel enters, destroy target enchantment.
{W}: Target permanent becomes white until end of turn.

Flying, lifelink
When Cloudshaper Pilgrim enters, return target creature or enchantment card with mana value 3 or less from your graveyard to your hand.

When Coercive Cardinal enters, choose an opponent. That player may have you gain 5 life. If the player doesn't, create two 1/1 white Cleric creature tokens.

Creatures have “Whenever this creature attacks or blocks, it fights another target creature.”

Counter target spell.
Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Flash
When Collapsed Mine enters, exile another target nonland permanent until Collapsed Mine leaves the battlefield.

Create a 1/1 colorless Construct Actor creature token for each creature you control.
Compose (Then if you cast this from your hand, exile it and create a Saga token with “r3—You may cast a copy of this card from exile without paying its mana cost.”)

(Add a quest counter as this enters. Sacrifice after 6.)
Whenever you cast a permanent spell, add a quest counter.
Choose a color that hasn't been chosen. Search your library for a permanent card that's exactly that color, reveal it, and put it into your hand. Then shuffle.
Exile Collect the World Stones. For the rest of the game, you may spend mana as though it were mana of any color.
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Trample
Colossal Greatwurm enters with five +1/+1 counters on it.
Whenever a player draws a card, put a +1/+1 counter on Colossal Greatwurm.
Remove three +1/+1 counters from Colossal Greatwurm: Create a 3/3 green Wurm creature token.

Flash
When Comforting Presence enters, return target spell with mana value 2 or less to its owner's hand.
Whenever an opponent casts their second spell each turn, draw a card.

Lifelink
Partner with Imperator Valtasius (When this creature enters, target player may put Imperator Valtasius into their hand from their library, then shuffle.)
At the beginning of your upkeep, return target Soldier card from your graveyard to your hand.

Concentrated Blast deals 5 damage to target creature.

Draw two cards.
Menagerie — If there are five or more creature types among creatures you control, draw three cards instead.

At the beginning of combat on your turn, you may exile a creature card from your graveyard. Then if a card exiled with Concoquo has flying, creatures you control gain flying until end of turn. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.

An opponent separates all noncreature, nonland cards in your graveyard into two piles. Put one pile into your hand and exile the other. Exile Conflicting Records.

Destroy all noncreature, nonland permanents.

Whenever an opponent draws a card, you may draw a card.

Exile up to one target creature.
Coalesce {5}{B}{B} (You may cast this from your graveyard for {5}{B}{B}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)
Whenever Consign to Oblivion deals damage to a permanent, exile that permanent.

Menace
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Machinate — {T}, Tap another untapped artifact you control: Exile target artifact or creature, then return that card to the battlefield tapped under its owner's control.

Civilized — This spell costs {1} less to cast if you control an artifact, a creature, and an enchantment.
Counter target spell.

Enchant creature or planeswalker
As Consumed by Fashion enters, put two loyalty counters on enchanted permanent.
You control enchanted permanent. It's an Okus planeswalker with “+1: Scry 1” and “-3: Draw a card” and loses all other card types and abilities.

Consuming Flame deals 6 damage to target creature.
Ferocious — If you control a creature with power 4 or greater, the damage can't be prevented and that creature can't be regenerated this turn.