msem-instigator

Gain control of target creature until end of turn. Untap it. Until end of turn, it gets -1/-1 and gains haste.

Target creature gets -2/-1 and gains winnow until end of turn. (Damage dealt to it also causes its controller to lose that much life.)

Whenever a creature enters under an opponent's control, you may pay 2 life. If you do, draw a card.

Whenever an artifact or enchantment you control enters, target player mills two cards.

When Three Seas Squire enters, target creature or Vehicle gets +2/+1 until end of turn.

When Morose Bohemian enters, scry 1, then draw a card.

As long as this creature isn't a Zombie, it and other Knights and Soldiers you control get +1/+1 and have vigilance. Otherwise, it and other Zombies you control get +1/+1 and have menace.
Arise {1}{W}{B} ({1}{W}{B}, Exile this from your graveyard as a sorcery: Create a black token copy of it that's also a Zombie and can't block.)

Enchant creature
When Sporegraft enters, germinate. (Put a +1/+1 counter on a creature or create a 1/1 green Saproling creature token.)
Enchanted creature has lifelink.

The next sorcery spell you cast this turn can be cast as though it had flash.
Draw a card.

Lionize {3}{R} ({3}{R}, Exile this card from your hand: Put a +1/+1 counter on target creature and it gains the following abilities until end of turn. You may cast this card on a later turn from exile.)
Menace
Whenever this creature deals damage to a player or noncreature permanent, create that many Treasure tokens.

When Wolfbriar Sapling enters, if you control seven or more lands, create a 2/2 green Wolf creature token.

Equipped creature gets +3/+0 and has vigilance.
Equip {3}

{1}{U}, Tap an untapped Noble you control: Hired Blades gets +2/+1 until end of turn and can't be blocked this turn.

Misty Churchyard enters tapped.
{T}: Add {W}.
{1}{W}{W}: Until end of turn, Misty Churchyard becomes a 1/4 Cleric creature with “Whenever this creature is dealt damage, put that many +1/+1 counters on it.” Activate only if you're horrific.

At the beginning of each combat, prevent all combat damage that would be dealt to and dealt by up to one target creature this turn.
{X}{G}{U}, Sacrifice Foreboding Calm: Create an X/X green and blue Plant Horror creature token with hexproof and trample.

Enchant creature
Enchanted creature doesn't untap during its controller's untap step.
{1}{U}: Tap enchanted creature.

Lifelink
Whenever Infectious Ego enters or attacks, exile the top card of target opponent's library. If it's a land card, that player gets a poison counter. You may play that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell.

Creature tokens you control get +1/+0.

This spell costs {1} less to cast for each creature type among creature cards in your graveyard.
Deathtouch
{1}{B}, Exile any number of creature cards from your graveyard with five or more different creature types among them: Search your library for a card, put it into your hand, then shuffle. Activate only as a sorcery.

Deathtouch
Whenever another creature you control dies, each opponent loses 1 life.
{2}{W}: Create a 1/1 colorless Servo artifact creature token.

Reach
Canopy Scout gets +1/+0 for each land card in your graveyard.

Counter target spell. Tap all lands that spell's controller controls and that player loses all unspent mana.

{T}: Add {B} or {G}. You lose 1 life.

{G/U}: Pangoling gains hexproof until end of turn.
{G/U}: Move a counter from target creature you control onto Pangoling.
{G/U}: Whenever Pangoling deals combat damage to a player this turn, draw a card. Activate only once each turn.
{1}: Pangoling gets +1/-1 or -1/+1 until end of turn.