Thrull
Native to Dominaria, Rath and Ravnica. Created by the necromantic biologist Endrek Sahr, the Thrulls were bred by the cabalistic Order of the Ebon Hand on Sarpadia in the decades before Dominaria's Ice Age. Intended as ritual fodder and slave labor, Thrulls were created by mixing necromancy with living alchemy and could be shaped to perform any function. Encouraged by early, basic successes, the Ebon Hand grew bolder with the breeds of Thrull produced until they finally lost control. The Thrulls rebelled, bringing the Ebon Hand down and going on to wage ecological war on the other races of Sarpadia. It was a war they eventually won, and the isolated continent fell fully under Thrull domination. Fortunately for the rest of the plane, they do not have the wits to imagine other lands over the horizon.
Millennia later, successive evincars (tyrannical rulers) of Rath experimented with the creation of life from leftover dead organisms. The Thrulls of Rath were a pathetic breed, created only to suffer at the sadistic whims of their creators. Even those bred for a purpose were twisted and mutilated so that every moment of life was torture.
On Ravnica, Thrulls are created from the "earthly slag" of Orzhov Guild patricians who ascend to the guild's ruling Ghost Council. These Thrulls are used as aides to important Orzhov officials and live easy lives by Dominarian and Rathi standards.
(Thrull Wizard, Blood Vassal, Mourning Thrull, Armor Thrull)
Read more about this topic: List Of Species In Magic: The Gathering