Protean Hydra

Protean Hydra enters the battlefield with X +1/+1 counters on it.If damage would be dealt to Protean Hydra, prevent that damage and remove that many +1/+1 counters from it.Whenever a +1/+1 counter is removed from Protean Hydra, put two +1/+1 counters on it at the beginning of the end step.