Tunneler Hydra

Devour 1 (As this creature enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with that many +1/+1 counters on it.)
{w}{b}, {t}: Exile Tunneler Hydra with X food counters on it, where X is the number of +1/+1 counters on it. At the beginning of the next end step, return it to the battlefield and replace each food counter with a +1/+1 counter.