msem-instigator

[+1]: Until your next turn, if a source would deal damage to Heping, Master Arbitrator, prevent all but 1 of that damage.
[–2]: Create a white Aura enchantment token named Pacifism attached to target creature an opponent controls. It has enchant creature and “Enchanted creature can't attack or block.”
[–8]: You get an emblem with “At the beginning of your end step, your life total becomes 20.”

Alquyut Mount can't attack or block alone.

Whenever Practical Battlemage attacks, catalyze. (The next spell you cast this turn costs {1} less to cast.)

Search your library for a basic land card and a Desert card, put them onto the battlefield tapped, then shuffle.

Menace
Ferocious — Whenever Zhenya, the Draconic becomes blocked by a creature, it deals 3 damage to that creature if you control a creature with power 4 or greater.

Flying
At the beginning of your end step, put a +1/+1 counter on Lepidopteradator if you're horrific. Otherwise, sacrifice it. (You're horrific as long as you've sacrificed a permanent or discarded a card this turn.)

Haste
Other Elementals you control get +1/+0 and have haste.

Look at the top four cards of your library. You may reveal a permanent card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Stampede — Whenever Etlan High Priest and a creature with greater power attack, Etlan High Priest gets +1/+1 until end of turn. Then you gain 1 life and scry 1.

Heretic (Whenever you cast a spell that doesn't share a color with this creature, it gets +1/+1 until end of turn.)
{1}{W}: You gain life equal to Sunken Outcast's power.

({T}: Add {B}, {G}, or {U}.)
Verdant Dominion enters tapped.

Ravaged Monument enters tapped.
{T}: Add {G}.
{2/G}{2/G}: Ravaged Monument becomes a 4/4 green Elemental creature until end of turn. It's still a land.

Meteorain deals 5 damage divided as you choose among any number of target creatures or planeswalkers.

You may have Terracotta Legion enter as a copy of any creature with mana value 1 or less you control, except it's an artifact in addition to its other types.

You don't lose unspent mana as steps and phases end except at end of turn.
Hand of the Chroma gets +1/+1 for each color of unspent mana you have.

As Publishing Press enters, you may exile a nonland card with mana value 2 or less from your hand.
At the beginning of your upkeep, you may cast a copy of the exiled card without paying its mana cost if the spell's mana value is 2 or less.

Vigilance, trample
Whenever another Horror you control enters, choose one —
• Destroy target artifact or enchantment.
• You gain 4 life.
• Apex Abomination fights another target creature.

First strike
Whenever an opponent casts a spell, Kiboshi's Guardian gains indestructible until end of turn.

({T}: Add {G} or {U}.)
Secluded Cascade enters tapped unless you control two or more basic lands.

Destroy up to X target artifacts and/or enchantments. If X is 3 or more, you gain twice X life. If X is 6 or more, create two X/X Elemental creature tokens that are all colors.

Flying
Crew 2 (Tap any number of creatures you control with total power 2 or greater: This Vehicle becomes an artifact creature until end of turn.)

When Wayward Bloodseeker enters, put a +1/+1 counter on up to one target creature you control. When you do, Wayward Bloodseeker deals damage to any target equal to the number of permanents you control with counters on them.

Wither (This deals damage to creatures in the form of -1/-1 counters.)
{1}{B}: Return Noonfiend from your graveyard to your hand.

Pathway of Lost Sultans enters tapped.
When Pathway of Lost Sultans enters, sacrifice it unless you pay {1}.
{T}: Add one mana of any color.

Whenever a creature you control dies, you may search your library for a creature card with lesser mana value, put it onto the battlefield tapped, then shuffle. Do this only once during each of your turns.