msem-instigator

Destroy target land. Then, judge target creature you control. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

Wraith of the Fens gets +2/+2 as long as you've gained life this turn.

Legacy (You may play this side of this card only from your graveyard. Exile it if it would be put into a graveyard or not resolve.)
Each opponent sacrifices a creature for each spite counter they have. If they didn't sacrifice any creatures this way, they discard that many cards instead.

Haste
When Wretched Merfolk enters, target creature can't block this turn.

Vigilance, trample
Pay 3 life: You choose if and how target creature attacks or blocks this turn. You choose before its controller declares other attackers or blockers. Activate only once each turn.

Whenever you cast a noncreature spell, you may put a progress counter on Wunderkind Devising.
[progress 1+] At the beginning of your upkeep, reveal the top three cards of your library. Put each artifact card from among them into your hand and the rest into your graveyard.
[progress 4+] Artifacts you control are artifact creatures with base power and toughness 5/5.
Artifacts you control are artifact creatures with base power and toughness 5/5.

Whenever an enchantment you control enters, draw a card.

{1}, {T}, Sacrifice two or more nonland permanents: Return target creature card from your graveyard to the battlefield. If permanents with total mana value 4 or greater were sacrificed this way, draw a card.

[+1]: Put a +1/+1 counter on up to one target creature, then put your choice of a menace, deathtouch, or trample counter on it.
[0]: Target creature or Xiong planeswalker you control fights target creature you don't control.
[–1]: Target player sacrifices a permanent.

[0]: Sacrifice a creature. When you do, Xiong Mao, Survivalist deals damage to any target equal to that creature's power, then put a number of loyalty counters on Xiong Mao equal to that creature's toughness.
[–2]: Return up to two target creature cards from your graveyard to your hand.
[–6]: You get an emblem with “Whenever a creature you control dies, you may draw cards equal to its power, then you may gain life equal to its toughness.”

[+1]: Create a 1/1 red Panda Monk creature token with “{T}: Target player exiles a card from their graveyard.”
[0]: You may sacrifice a creature. If you do, search your library for a creature card and a land card, reveal them, put them into your hand, then shuffle.
[–2]: Xiong Mao deals damage to target creature or planeswalker equal to the greatest power among creatures you control and cards in your graveyard.
[–7]: Any number of players' life totals each become equal to the number of cards in their graveyard.

You may activate loyalty abilities of Xirix, the Usurper during extra turns any time you could cast an instant.
[+1]: Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.
[–2]: Destroy each nonland, non-Xirix permanent with the greatest mana value among non-Xirix permanents on the battlefield.
[–6]: Put target permanent card from a graveyard onto the battlefield under your control.

Renown 2 (When this creature deals combat damage to a player, if it isn't renowned, put two +1/+1 counters on it and it becomes renowned.)
Each creature you control with a +1/+1 counter on it has indestructible.

Enchant creature
{R}: Enchanted creature gets +1/+0 until end of turn.
Ferocious — Whenever enchanted creature attacks, if you control a creature with power 4 or greater, enchanted creature gains double strike until end of turn.

{R}: Xiyue Dragondancer gets +1/+0 until end of turn.
Whenever you cycle Xiyue Dragondancer or it attacks, create a Treasure token.
Basic landcycling {1}{R} ({1}{R}, Discard this card: Search your library for a basic land card, reveal it, and put it into your hand, then shuffle.)

Whenever one or more creatures you control deal combat damage to a player or planeswalker, put a +1/+1 counter on target creature you control.

Flying
Whenever another creature you control enters, create an Idol token.
Whenever you put a +1/+1 counter on Ya'Ling, put a +1/+1 on each other creature you control. This ability triggers only once each turn.

Spirited (When this creature enters, you may activate one of its activated abilities without paying its cost.)
{4}{G}: Target creature gets +2/+2 until end of turn.

Other enchantment creatures you control get +1/+1.
As long as you control three or more enchantment creatures, if a triggered ability of an enchantment you control would trigger, that ability triggers an additional time.

Golden age (If you cast an instant or sorcery spell, activated a nonmana ability, and attacked this turn, enter a renaissance for this game.)
{1}, Sacrifice a creature: Draw a card. Each opponent loses 1 life and you gain 1 life.
Whenever you sacrifice a creature, if you're in a renaissance, each opponent sacrifices a creature. This ability triggers only once each turn.

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.

Flying
When Yielder of Ambition enters, target creature gets +2/+2 until end of turn.
Fleeting {W} (You may cast this spell for its fleeting cost. If you do, sacrifice it at the beginning of the next end step.)

Other Rebel creatures you control get +1/+0.
When Youthful Renegade enters, create a 1/1 white Rebel creature token.

Whenever Yrodu, the Lotus Ablaze attacks, eight target permanents don't untap during their controller's next untap step.
Whenever Yrodu blocks a creature, destroy that creature at end of combat.