Cursed Battlefield

Whenever a nontoken creature dies, place a
corpse counter on Cursed Battlefield.
At the beginning of your upkeep, create X 1/1
black Skeleton creature tokens, where X is the
number of corpse counters on Cursed Battlefield.
"Seeing your friends die in battle is bad enough, but watching their corpse rise again and attack you is a
horror no man should endure."