Blister Hydra

Blister Hydra enters the battlefield with X +1/+1 counters on it.
{1}{b}{b}: Put a +1/+1 counter on Blister Hydra.
{b}{b}{b}{t}: Remove all +1/+1 counters from Blister Hydra. Blister Hydra deals damage equal to the number of counters removed this way to each other creature.