msem-instigator

Enchant creature
Enchanted creature gets +2/+2 and has lifelink.

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Blood-Tithe Harpy enters, target player loses 1 life and you gain 1 life.

Target player sacrifices a creature. If you control an artifact, draw a card.

Destroy target creature. You gain 1 life for each card in its controller's graveyard.

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Enchanted creature gets -2/-2.
Whenever enchanted creature blocks, its controller loses 2 life.

Whenever Consuming Doom or another enchantment you control enters, you may have target creature get -1/-1 until end of turn.
Whenever a source an opponent controls destroys an enchantment you control, that player sacrifices a creature.

Target creature gets +2/+0 and gains lifelink until end of turn.

Enchant creature
Enchanted creature has flying and “Sacrifice a creature: This creature gets +2/+1 until end of turn.”
When Fallen Ideal is put into a graveyard from the battlefield, return Fallen Ideal to its owner's hand.

{3}{B}: Regenerate Flesh Hoarder Ghoul. (The next time this creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)

Flying (This creature can't be blocked except by creatures with flying or reach.)
At the beginning of your upkeep, put a +1/+1 counter on Fleshrender Demon and you lose 1 life.

Put target creature card from a graveyard onto the battlefield under your control. If that card was put into that graveyard this turn, it enters with an additional +1/+1 counter on it.

Kicker {2}{B} (You may pay an additional {2}{B} as you cast this spell.)
Flying
When Heartstabber Mosquito enters, if it was kicked, destroy target creature.

Each player exiles up to X cards from their graveyard. Then each player loses life, discards cards and sacrifice creatures equal to X minus the number of cards that player exiled this way.

Whenever a creature you control dies, you may put a +1/+1 counter on target creature you control.

Whenever a creature you control dies, Insidious Terror gets +1/+0 and gains menace until end of turn.

As an additional cost to cast this spell, tap an untapped artifact you control.
Target player discards two cards.

Flying (This creature can't be blocked except by creatures with flying or reach.)
As long as Nightclad Stalker is enchanted, it gets +1/+0 and has deathtouch and lifelink.

Destroy target creature. Create a tapped 2/2 black Zombie creature token.

Menace (This creature can't be blocked except by two or more creatures.)
Whenever a creature blocks, its controller loses 1 life.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
When Poisonheart Undead enters, you draw a card and you lose 1 life.

Kicker {3} (You may pay an additional {3} as you cast this spell.)
Return target creature card from your graveyard to your hand. Then if this spell was kicked, return another target creature card from your graveyard to your hand.

When Scrapyard Aberration enters, you may sacrifice another artifact. If you do, target creature gets -2/-2 until end of turn.

Target player discards two cards. If a creature you control died this turn, that player loses 2 life.

When Seven Deadly Sins has seven or more sin counters on it, sacrifice it.
{B}{B}, Put a sin counter on Seven Deadly Sins: Destroy target creature. This ability costs {1} more to activate for each sin counter on Seven Deadly Sins.

Sacrifice a creature: Soulsorrow Shade gets +2/+2 until end of turn.