Dark Ritual

Innocent Blood

Each player sacrifices a creature of their choice.

Davriel, Soul Broker

+1: Until your next turn, whenever an opponent attacks you and/or planeswalkers you control, they discard a card. If they can't, they sacrifice an attacking creature.
−2: Accept one of Davriel's offers, then accept one of Davriel's conditions.
−3: Target creature an opponent controls perpetually gets -3/-3.

Swamp

A-The Meathook Massacre

When The Meathook Massacre enters, each creature gets -X/-X until end of turn.
Whenever a creature you control dies, each opponent loses 1 life.

Infernal Grasp

Destroy target creature. You lose 2 life.

Thoughtseize

Target player reveals their hand. You choose a nonland card from it. That player discards that card. You lose 2 life.