Nim
Quick, "natural" undead found in the Mephidross Swamp of Mirrodin. The toxic necrogen mists have a zombification affect on living creatures, most specifically the Moriok tribe of humans. The Nim have cranial plating covering their faces as the necrogen causes metal buildup and loss of eyes (and therefore sight). They also expel their own necrogen from vents that erupt from their rotting skin. They are controlled by the warlord Geth and are constantly in conflict with the Auriok and Leonin of the Razor Plains as the Mephidross expands.
(Nim Lasher)
Read more about this topic: List Of Species In Magic: The Gathering