PuffDD, Rotter of Worlds

Infect, indestructible

Enamel Corps Commander- PuffDD has +1/+1 for each rot counter.

{p/b}{p/r}: Whenever a creature an opponent controls blocks during this turn, put a rot counter on it. (Creature with a rot counter gets -1/-1 and gains "at the beginning of its upkeep, deal 1 damage to its controller for each rot counter".)