msem-instigator

When Lie in Ambush enters, create a tapped 3/3 green Beast creature token.
When Lie in Ambush leaves the battlefield, you may have target creature you control fight target creature you don't control. (Each deals damage equal to its power to the other.)

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

Equipped creature gets +2/+0 and has “{T}, Unattach Javelin: It deals 2 damage to target creature.”
Equip {2}

Ferocious — At the beginning of your upkeep, if you control a creature with power 4 or greater, draw a card.

Sacrifice a creature: Each opponent loses 1 life and you gain 1 life.
Sacrifice two creatures: Draw a card.
Sacrifice three creatures: Exile target creature or planeswalker.

Whenever you cast a noncreature spell, Hutao's Wardens deals 2 damage to each opponent. Then if that spell was an enchantment, scry 2.

Enchant player
When Curse of Fangs enters, gain control of target creature enchanted player controls. It becomes a Vampire in addition to its other types.
Creatures attacking enchanted player have lifelink.

Flying
Whenever Aether Crosser attacks, you may aetherize another target tapped creature you control. (To aetherize, create a token that's a copy of it, then exile that token.)
Crew 1

Until end of turn, you may play cards you don't own from exile. Scry 1.

Whenever one or more cards leave your graveyard for the first time each turn, create a 3/2 green Crocodile creature token with trample.

Primal {G} (During your turn, you may cast this spell for {G} instead of playing a land.)
When Charging Nymph enters, it gets +2/+0 and gains haste until end of turn.

Creatures you control get +2/+1 until end of turn. Citizens and Peasants you control gain first strike until end of turn.

When Sunwright Scion enters, put a +1/+1 counter on each other creature you control.
At the beginning of each combat, you may have target creature with a +1/+1 counter on it gain your choice of vigilance, lifelink, or trample until end of turn.

Gestalt (When this or another creature enters under your control, you may merge it with the one in play, keeping counters and attachments. They become the permanent on top plus all abilities from under it.)
Vigilance, lifelink
Whenever an opponent casts a spell, this permanent phases out until end of turn. (Treat it and anything attached to it as though they don't exist until end of turn.)

Heated Dispute deals 3 damage to any target.
Ferocious — This spell costs {2} less to cast if you control a creature with power 4 or greater.

Whenever you pay a tithe, you may pay {2}. If you do, each opponent loses 3 life and you gain 3 life.

Abandoned Preserve enters tapped if you control another nonbasic land.
{T}: Add {B} or {G}.

You may reveal the second card you draw each turn as you draw it. When you do, create a 2/2 blue Avatar Wizard creature token with prowess if it's a creature card. If it's a land card, create a Treasure token. If it's a noncreature, nonland card, Steward of Second Sphere can't be blocked this turn.
{3}{W/U}{W/U}: Scry 2.

Dutiful Chasqui gets +2/+1 as long as you control two or more other creatures that share a name with it.
A deck can have any number of cards named Dutiful Chasqui.

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you draw your second card each turn, add a quest counter.
1, 2 — Scry 3.
3 — Create a blue and green enchantment token named The Heart with “Whenever you tap a land for mana, add one mana of any color.”

When 11-A Lionheart enters, it deals 2 damage to each nonartifact creature.

When Gau Ding Soulhoard dies, create X 1/1 colorless Spirit creature tokens, where X is its power.
Scavenge {4}{B} ({4}{B}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

When Humored Outlaw enters, choose one —
• Put a +1/+1 counter on Humored Outlaw. (Assassins, Mercenaries, Pirates, Rogues, and Warlocks are outlaws.)
• Destroy target artifact or enchantment.

{3}, {T}, Reveal a card at random from your hand: Draw a card.

Instant and sorcery spells you control have leitmotif. (Exile that spell as it resolves if you cast it from your hand. When you next cast a spell that shares a color with that card, you may cast it from exile without paying its mana cost.)