msem-instigator

Whenever a creature enters the battlefield, if it entered from a graveyard or a player cast it from a graveyard, return Ceaseless Stalker from your graveyard to the battlefield at the beginning of the next end step.

First strike
Whenever a creature blocks Celestial Conscript, put a -1/-1 counter on that creature.

Reach
As Celestial Principality enters the battlefield, choose a number.
Noncreature spells with mana value equal to the chosen number can't be cast.

Flying (This creature can't be blocked except by creatures with flying or reach.)
Motivate 1 (When this creature enters the battlefield, you may motivate target creature with less power than this by putting a +1/+1 counter on it.)

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Whenever Centipede Engine attacks, you may have target creature block it this turn if able.

Defender, trample
As long as you control a creature with power greater than its base power, Chained Minotaur can attack as though it didn't have defender.

Trample
Chained Ravager can't attack or block unless a player has lost life this turn.

Haste
Winnow (Damage dealt to this creature also causes you to lose that much life.)

Haste
When Challenging Pupil enters the battlefield, conjure a card named Fatigue and put it on top of your library. (It's a colorless sorcery that costs {2} with “Draw a card.”)

Menace (This creature can't be blocked except by two or more creatures.)
Heroic — Whenever you cast a spell that targets Champion of Keranos, Champion of Keranos deals 2 damage to each opponent.

Flying
When Champion's Steed enters the battlefield, put a flying counter on target Avatar you control without flying.

Whenever you cast a spell, reveal the top card of your library. If a card that shares a card type with that spell was revealed this way, Chaos Tradewinder gains flying until end of turn.

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.)
Chaosphere Ravager attacks each combat if able.

When Chaotic Pupil enters the battlefield, harmonize twice. (To harmonize, trigger up to one harmony of a permanent you control.)
Harmony — Draw a card, then discard a card.

Trample
Whenever Charging Cassowary deals combat damage to a player, you may cast a copy of an Adventure of a permanent you control.

When Charming Marauder enters the battlefield, you may destroy target artifact or enchantment.
Recite {2}{W} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters the battlefield or if it would leave the battlefield.)

Flash
When Charnel Legion enters the battlefield, destroy target creature or planeswalker an opponent controls that was dealt damage this turn. When you do, you gain 2 life.

Trample
Whenever Chasqui Veteran deals combat damage to a player, if you control three or more artifacts and/or enchantments, draw a card.

Whenever Chi Lee attacks, you may discard a card. If you do, create a 4/4 black Demon creature token with “Whenever this creature deals combat damage to a player, return target card from your graveyard to your hand.”

Whenever another creature you control dies, target player loses 1 life and you gain 1 life.

Flying

When Chronic Traitor enters the battlefield, each player sacrifices a creature. If Chronic Traitor's paranoia cost was paid, each player sacrifices two creatures instead.
Paranoia {2}{B}{B} (You may cast this spell for its paranoia cost when a permanent you control leaves the battlefield.)

When Churning Spellroot enters the battlefield, create three 1/1 black Worm creature tokens.

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

{3}{G}: Search your library and/or graveyard for an Aura card, reveal it, and put it into your hand. If you search your library this way, shuffle.
{1}{U}: Untap target creature.