Escapee Hydra

{x}{r}{r}{w}: Monstrosity X (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous).
As long as this creature is monstrous, it gets
trample and "At the beginning of your end step,
put a -1/-1 counter on this creature."
Breaches in the banishment protocol are rare, and
when they happen, the villagers respond as one, and
flee.