Liquefactive Necrosis

Enchant Creature
When enchanted creature dies, attach Liquefactive Necrosis to a creature you control.
Each upkeep, create a black Aura enchantment token named Liquefactive Necrosis attached to a creature you control which has no Auras attached to it. The token isn't legendary.
Enchanted creature has deathtouch and infect.
Each end step, if all creatures you do not control any creatures without Auras attached, sacrifice all permanents called Liquefactive Necrosis.