Carrion Feeder

Carrion Feeder can't block.
Sacrifice a creature: Put a +1/+1 counter on Carrion Feeder.

Tragic Slip

Target creature gets -1/-1 until end of turn.
Morbid — That creature gets -13/-13 until end of turn instead if a creature died this turn.

Whenever another creature dies, you may have Hissing Iguanar deal 1 damage to target player or planeswalker.

When Serrated Scorpion dies, it deals 2 damage to each opponent and you gain 2 life.

{R}, Sacrifice a creature: Scorched Rusalka deals 1 damage to target player or planeswalker.

When Footlight Fiend dies, it deals 1 damage to any target.

When Doomed Dissenter dies, create a 2/2 black Zombie creature token.

Flying
Whenever Falkenrath Noble or another creature dies, target player loses 1 life and you gain 1 life.

When Perilous Myr dies, it deals 2 damage to any target.

When Myr Sire dies, create a 1/1 colorless Phyrexian Myr artifact creature token.

When Deathbloom Thallid dies, create a 1/1 green Saproling creature token.

Whenever a player sacrifices a creature, you may put a +1/+1 counter on Mortician Beetle.