Abyssal Hydra

Abyssal Hydra enters the battlefield with one abyss counter and X +1/+1 counters on it.
At the beginning of each end step, if at least four +1/+1 counters were put onto Abyssal Hydra that turn, you may remove four of them. If you do, put an abyss counter on Abyssal Hydra.
Remove an abyss counter from Abyssal Hydra: Exile target creature an opponent controls.