Darkrealm Dweller

Intimidate
{x}{x}{b}{b}: Monstrosity X. (If this creature isn't
monstrous, put X +1/+1 counters on it and it becomes monstrous.)
Whenever Darkrealm Dweller becomes
monstrous, each other creature you control is no
longer monstrous. Tap Darkrealm Dweller.