Mass of Fermented Dregs

At the beginning of your end step each opponent creature gets a -1/-1 counter. Should a creature
with a -1/-1 counter on it be destroyed, each
opponent creates a 2/2 zombie creature token
with decayed while you create two 2/2 zombie creature tokens.
{2}{b}: Destroy target zombie, draw a card.
{5}{b}{b}: Deal X damage to any target where X is
equal to the number of zombies you control.