Tombstone

Fading 4
At the beginning of your upkeep put a 1/1 Skeleton creature token with haste on to the battlefield. When Tombstone leaves the battlefield put four 1/1 Skeleton creature tokens with haste on to the battlefield.
"Troop building that periodically deploys Skeletons to fight the enemy. When destroyed, spawns 4 Skeletons. Creepy!"