Protean Hydra [Magic 2010]

Set: Magic 2010 Type: Creature — Hydra Rarity: Mythic Cost: {X}{G} 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 next end step.