Thrull

Thrulls are creatures animated from dead flesh, usually with black mana, though some have been mono-white. The process of creating thrulls is much different from animating the undead, as thrulls are actually living creatures. Thrulls are often used for ritual sacrifice as their sacrifice releases mana stored in them.

sources:

https://scryfall.com/card/gpt/1/absolver-thrull

https://mtg.gamepedia.com/Thrull