msem-instigator

Whenever Icepeak Phantasm becomes the target of a spell or ability, an opponent may pay {2}. If they do, sacrifice it.

Art of war — At the beginning of your end step, if Kurayami Butcher dealt damage to an opponent, you may destroy target creature that was dealt damage this turn.

Whenever another Citizen you control dies, you gain 2 life.
{2}{B}, Exile a Citizen card from your graveyard: Each opponent loses 2 life.

Wild Realms enters tapped unless you control two or more other lands.
{T}: Add {G}.
{T}, Pay 1 life: Add {R} or {W}.

Haste
When Greenwood Outrider enters, creatures you control gain trample and get +X/+X until end of turn, where X is the number of storied permanents you control. (Enchantments and legendary permanents are storied.)

Hexproof

Trample, haste
When Relonche Cavalry enters, other creatures you control get +1/+0 and gain trample and haste until end of turn.

Flameblade deals 4 damage to target player or planeswalker.

Whenever you cast a noncreature spell, Slyten Technician gets +1/+0 until end of turn, then scry 1.

If a player would draw a card, instead that player may put a card they own exiled with Arroyo, the Bound into their hand.
{3}: Search target player's library for a card and exile it face down, then that player shuffles. They may look at that card for as long as it remains exiled.

This spell costs {2} less to cast if its target's controller is poisoned.
Counter target spell unless its controller pays {X}.

Equipped creature gets +2/+3.
Equip {4}
{2}: Attach Lodestone Sword to target artifact creature you control.

Whenever another creature dies, upgrade Entitled Griefer. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Deathtouch
• Lifelink

Create a 2/2 red and white Cat Knight creature token. Creatures you control get +1/+1 and gain haste until end of turn.

Thornwood Falls enters tapped.
When Thornwood Falls enters, you gain 1 life.
{T}: Add {G} or {U}.

Vanishing 5 (This creature enters with five time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
Whenever you remove a time counter from Rallios, create a tapped 2/2 black Zombie creature token.

Stampede — Whenever Exuberant Hunter and a creature with greater power attack, draw a card.

Deathtouch
Whenever a +1/+1 counter is put on a creature you control, that creature gains deathtouch until end of turn.

At the beginning of each main phase, each player adds {W}{U}{B}{R}{G}.

First strike
When Imperial Dragoon enters, target creature gets +2/+0 until end of turn.

When Mirror Paradigm enters, conjure a card named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)
Once each turn, when a sorcery card is put into your graveyard from anywhere, you may copy it. If you do, you may cast the copy. (You still pay its costs.)

Flying, lifelink
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever Recreator of Myths attacks, you may cast target instant or sorcery spell from your graveyard. If you do, exile that card instead of putting it into your graveyard as it resolves.

When Kessig Wolftamer enters, create a 2/2 green Wolf creature token.
{4}{R}{G}: Transform Kessig Wolftamer. Activate only if it's attacking.

Whenever a creature you control deals combat damage to a player, if it has no +1/+1 counters on it, put a +1/+1 counter on it. You gain 1 life.

Reach
Whenever Palm Walker or another creature you control enters, you gain 2 life.