msem-instigator

Vigilance
Art of war — At the beginning of your end step, if Yuso, Light of Jidai dealt damage to an opponent this turn, you may search your library for a creature card with mana value 2 or less, reveal it, put it into your hand, then shuffle.

Flying
Erratic (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order.)
Whenever Zaidha, Seraph of Calamity deals combat damage to a player, choose up to two target nonland permanents that player controls and target nonland permanent you control. Destroy one of those permanents at random.

Whenever Zana, the Dreamer attacks, you may pay {3}{R}{R}. If you do, for each attacking nontoken creature you control, create a tapped and attacking token that's a copy of it, except the tokens aren't legendary. Exile those tokens at the beginning of the end step.

First strike
Whenever Zankon, Ema's Claws blocks or becomes blocked, put a +1/+1 counter on each creature you control.

When Zareen, the Second Shah enters, search your library for a creature card with mana value 2 or less or a planeswalker card, reveal it, put it into your hand, then shuffle.
Monument {2}{W}{W} (You may cast this transformed from your graveyard for its monument cost. Exile it if it would leave the battlefield or not resolve.)

Voracious 1 (As this enters, you may sacrifice an artifact or creature. If you do, it enters with a +1/+1 counter on it.)
At the beginning of combat on your turn, if you sacrificed a permanent this turn, target creature you control gains trample and haste until end of turn.

Whenever two or more creatures an opponent controls block, adjudicate. (Create a white Aura enchantment token with enchant creature and “Sacrifice this token: Untap enchanted creature” attached to target creature.)
Enchanted creatures you control have menace.

Whenever Zealous Scaleblight becomes tapped, it deals 1 damage to any target.

First strike (This creature deals combat damage before creatures without first strike.)
When Zephyr Rider enters, you may have another target creature you control gain first strike until end of turn.

First strike, menace
When Zhargetan Reclaimer enters, put any number of cards your opponents own from exile into their owners' graveyards. If three or more cards were put into graveyards this way, create two 1/1 Scout creature tokens that are all colors.

Flash
When Zhedina Coastguard enters, you may have any number of creatures you control have base power and toughness 1/3, 2/2, or 3/1 until end of turn.

{1}, Sacrifice Zhedina Confiscator: Destroy target artifact or enchantment.

When Zhedina Provisioner enters, creatures you control get +1/+1 until end of turn. You gain 2 life.

Flying, ward {2}
Whenever you cast a noncreature spell, choose up to one target creature. If that spell's mana value is greater than that creature's power, put +1/+1 counters on it equal to the difference.

When 1-ST Thankless Companion enters, draw a card.

When AOSE Extractor enters, crystallize. (Put a +1/+1 counter on a creature you control or create a Treasure.)

Flying
Whenever AOSE Skydrone deals combat damage to a player, draw a card.

Flying

At the beginning of your upkeep, you may pay 2 life. If you do, crystallize. (Put a +1/+1 counter on a creature you control or create a Treasure.)

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)

{1}, Sacrifice Aberrant Apostle: Choose one. This ability costs {1} less to activate as long as Aberrant Apostle entered this turn.
• Destroy target artifact.
• Destroy target enchantment.
• Exile target card from a graveyard.

At the beginning of your end step, if you're horrific, you draw a card and you lose life equal to the number of cards in your hand. (You're horrific as long as you've sacrificed a permanent or discarded a card this turn.)

Whenever you cast a noncreature spell, put a +1/+1 counter on Abjuration Savant. It gains flying until end of turn.
When Abjuration Savant dies, you gain life equal to its toughness.

Trample
Whenever another Horror you control enters, put a +1/+1 counter on Abominable Xenoflora.

Wither (This deals damage to creatures in the form of -1/-1 counters.)
When Abyssal Familiar dies, it deals 1 damage to you and to any target.