Flood Hydra

At the beginning of each end step, put a virus
counter on each creature you don't control.
Creatures you don't control get -1/-1 for each
virus counter on them.
Whenever a creature you don't control with a
virus counter on it dies, create a 1/1 green
infection creature token with toxic 1.
{u}{b}: Sacrifice a infection creature,
draw a card