msem-instigator

Whenever Yenzu Mindwrencher perseveres, each opponent discards a card. (A creature perseveres when it survives damage.)

{1}{G}: Create a 1/1 colorless Construct artifact creature token.
{2}{G}{G}: Target creature you control becomes 4/4. (This lasts indefinitely.)
{4}{G}{G}{G}{G}: Put four +1/+1 counters on each creature you control with power 4 or greater.

Whenever you cast a spell, harmonize twice. (To harmonize, trigger up to one harmony of a permanent you control.)
Harmony — Yita, Almgrove Prodigy gains your choice of flying, first strike, vigilance, lifelink, hexproof, or haste until end of turn.

Flying, vigilance
If a nonland permanent entering the battlefield would cause a triggered ability of a permanent you control to trigger, you may have that ability trigger an additional time. If you do, each opponent copies that ability and may choose new targets for the copies.

Hexproof
{1}{W}{U}, {T}: Exile target creature you control. Return that card to the battlefield under its owner's control at the beginning of the next end step.

Lifelink
Whenever Zagos Abomination attacks, exile another target creature you control, then return it to the battlefield under your control tapped and attacking. It gains menace until end of turn.

Flying
When Zagos Roc enters, exile target nonland permanent an opponent controls until Zagos Roc leaves the battlefield.

{1}{R}, {T}, Sacrifice a land: Create a colorless Desert land token with “{T}: Add {C}.”
{1}{R}, {T}, Sacrifice a Desert: Destroy up to two target lands.

When Zareen Kahroba, Shah enters, if you cast her, untap each Satrapy you control.
Whenever each Satrapy you control becomes tapped for the first time during each of your turns, untap it.

Zareen's Pariah is all colors.
Flying
During each of your turns, you may cast a spell of each color from your graveyard.

Flying
Whenever you attack with three or more creatures, exile the top card of your library. You may play that card until you exile another card with Zarthane, Scourge of Galdurheim.
{2}{B/R}: Target creature gets +1/+0 and gains menace until end of turn. Activate only as a sorcery.

Transcend (Activate as a sorcery to gain the next type and a +1/+1 counter.)
You may play an additional land on each of your turns.
{1}{R}{G}: Demigod — Whenever a land you control enters this turn, it deals 3 damage to up to one target creature or planeswalker.
{6}{R}{G}: God — Until end of turn, lands you control become 3/3 Spirit creatures with indestructible and haste that are still lands. Untap them.

Menace

Enspirit (As you cast this spell, you may exile a nonenchantment creature you control until this leaves the battlefield or fails to resolve. Reduce this spell's cost by the exiled card's mana value.)
Zoulev Envoy can't be blocked.

Whenever you cast your first noncreature spell each turn, you may cast a creature spell with lesser mana value from your hand without paying its mana cost.
Whenever you attack with three or more creatures, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost.

When Abomination Broodmother dies, create a 3/2 green Horror creature token.

Abomination Sculptor has deathtouch and lifelink as long as it's attacking.

Transcend (Activate as a sorcery to gain the next type and a +1/+1 counter.)
Vigilance, trample
{G}{W}: Demon — Abwad Kahroba gains “At the beginning of combat on your turn, you may put a +1/+1 counter on another target creature.”
{X}{G}{W}: Elder — Create X 2/1 black Horror creature tokens. You gain X life.

Deathtouch
Abyss Surger enters with X +1/+1 counters on it, where X is the greatest power among creature cards in your graveyard.

When this creature enters, put two -1/-1 counters on a creature you control.
{T}, Sacrifice another creature: Add {C}{R}. Spend this mana only to cast creature spells or activate abilities of creatures or creature cards in your graveyard.

Flying
{2}{W}, Exile a non-Spirit creature card from your graveyard: Create a 1/1 white Spirit creature token with flying.

{T}, Pay 1 life: Surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)
At the beginning of your end step, if your life total is less than 5, sacrifice Achet-Aton's Vizier. If you do, create a 4/4 black Demon creature token with flying.

This spell costs {2} less to cast if you've cast both an instant spell and a sorcery spell this turn.
Haste

Flying
Whenever you draw a card, put a +1/+1 counter on Acolyte of Life.
Remove two counters from Acolyte of Life: It phases out. (Treat it and anything attached to it as though they don't exist until its controller's next turn.)

Flash
Flying, first strike, lifelink