Soulless Acolyte

Blight (When this creature does non-lethal combat damage to another creature, flip a coin. If heads, that creature receives a -1/-1 counter at the beginning of its controller's next upkeep; if tails, nothing happens.)

When Soulless Acolyte dies, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)