msem-instigator

Tithe (When this creature enters, you may tap three other artifacts and/or creatures you control.)
When Cataclysmic Preacher's tithe is paid, return target instant or sorcery card from your graveyard to your hand.

When Catacomb Dredger dies, return another target creature card from your graveyard to your hand.

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.)
Whenever Cauldish Arrogant becomes blocked by one or more creatures, reveal the top card of your library. Cauldish Arrogant deals damage equal to that card's mana value to each creature blocking it. Then put that card into your hand.

Vigilance, reach
Whenever Cave Spider blocks a creature with flying, Cave Spider gets +2/+0 until end of turn.

Flying
Whenever Cavern Scourge attacks, you may exile a card from your graveyard. If you do, you gain 3 life.

Whenever a creature enters, 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.

Flying
When Celebrant of Jubilation enters, untap all creatures you control.
Cycling {2} ({2}, Discard this card: Draw a card.)

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

Flying
When Cerulean Sovereign enters, you may return target creature an opponent controls or instant or sorcery card in your graveyard to its owner's hand.

Cesspool Scrapper can't block.
{5}{U}, Exile Cesspool Scrapper from your graveyard: Draw two cards.

When Ch'aska Walla Captain enters, if you cast it, you may return an enchantment card from your graveyard to the battlefield. When you do, you gain life equal to that enchantment's mana value.

Haste
When Challenging Pupil enters, 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.”)

Whenever you sacrifice a permanent, Champion of Foibles becomes a Demon with base power and toughness 6/6, flying, and trample until end of turn.
{3}{B}: Judge target creature you control. Activate only as a sorcery. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

As long as Champion of Ideals has one or more +1/+1 counters on it, it's an Angel with base power and toughness 4/4, flying, vigilance, and lifelink.
{3}{G}: Judge target creature you control. Activate only as a sorcery. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to 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.

Flash
Flying
When Champion of the Provinces enters, return any number of other permanents you control to their owner's hands.

Menace
Creatures you control with mana value 1 get +2/+0 and have menace.

When Chantwood Channeler enters from your graveyard, it gains haste and creatures you control get +3/+3 and gain trample until end of turn.
{5}{G}{G}{G}, Sacrifice a creature: Return Chantwood Channeler from your graveyard to the battlefield. Activate only as a sorcery.

Other Shaman creatures you control get +1/+0.
Revive {4}{G}{G} ({4}{G}{G}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)
{1}{G}: Untap Chantwood Guards.

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.

When Chaotic Pupil enters, 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.

Once each turn, when a creature you control attacks alone, you may untap target attacking creature. After this combat, there's an additional combat step.