Imperil Hydra

{x}{g}{g}{g} Monstrosity X (If this creature isn't
monstrous put X +1/+1 counters and 1 provoke
counter on it and it becomes monstrous.)
As long as Imperil Hydra has a provoke counter
on it, you may activate it's monstrosity ability
more than once.
Whenever Imperil Hydra gains a provoke counter
it gets +X/+X until end of turn.