Toxic Deluge

As an additional cost to cast this spell, pay X life.
All creatures get -X/-X until end of turn.

Damnation

Destroy all creatures. They can't be regenerated.

Whenever Zulaport Cutthroat or another creature you control dies, each opponent loses 1 life and you gain 1 life.

Search your library for a card, then shuffle and put that card on top. You lose 2 life.

Whenever Blood Artist or another creature dies, target player loses 1 life and you gain 1 life.

Destroy target creature or enchantment an opponent controls. You lose life equal to that permanent's mana value.