msem-instigator

All creatures get -2/-2 until end of turn.

At the beginning of your upkeep, mill a card.
Whenever you cast a spell from your graveyard, create a 2/2 green Wolf creature token.

Look at the top three cards of your library. Put one on top and the rest on the bottom in any order.
Draw two cards. You lose 2 life.

Target creature gets -1/-1 until end of turn. Create a 1/1 green Saproling creature token.

When Furnished Ghul dies, create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

Wither (This deals damage to creatures in the form of -1/-1 counters.)

Gangling Titan has menace and deathtouch as long as there are four or more card types among cards in your graveyard.

Enchant creature
Enchanted creature gets -1/-1 and can't block.
Enchanted creature gets an additional -1/-1 for each card named Garrote in your graveyard.

Whenever you cast a noncreature spell, put a quest counter on Gate to the Beyond.
At the beginning of your upkeep, if there are three or more quest counters on Gate to the Beyond, you draw a card and you lose 1 life. Then if there are six or more quest counters on it, each opponent loses 2 life.

{T}, Pay 2 life: Add {B}.
{T}: Add one mana of any color. Spend this mana only to cast spells from your graveyard or activate abilities of cards in your graveyard.

Defender (This creature can't attack.)
Hexproof (This creature can't be the target of spells or abilities your opponents control.)

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever a creature dies, add a quest counter.
Target player loses 1 life and you gain 1 life.
Put target creature card from a graveyard onto the battlefield under your control.
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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.)

At the beginning of your upkeep, mill two cards.
{1}{B}{B}: Until end of turn, Gaunt Abnormality becomes a copy of target creature card in your graveyard, except it's 3/3.

Once during each of your turns, when you sacrifice a permanent, you may have target opponent lose 3 life unless they sacrifice a nonland permanent or discard a card.

Choose one —
• Creatures your opponents control get -1/-1 until end of turn.
• Harmonize twice. (To harmonize, trigger up to one harmony of a permanent you control.)

Return target creature card from your graveyard to the battlefield. If you control a Demon, each opponent loses 3 life.

Return target creature card from a graveyard to the battlefield under your control. Post a bounty on that creature. (Put a bounty counter on that creature. It has “When this creature dies, each opponent draws a card” as long as it has a bounty counter on it.)

Trample
When Ghastly Progenitor enters, each opponent reveals their hand. Choose two nonland cards revealed this way. Their owners discard those cards.

Deathtouch
When Ghastly Scorpion dies, you draw a card and you lose 1 life.

Flash

Until end of turn, target creature you control gains “When this creature dies, return it to the battlefield under your control with a +1/+1 counter on it.”

Destroy target creature or planeswalker. If a planeswalker is destroyed this way, search its owner's graveyard, hand, and library for any number of cards with the same name as that card and exile them. Then that player shuffles.

Flying
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)