Xadar, the Chained Horror

Trample, Menace
{4}{b}{b}{b}: Monstrosity 1
As long as Xadar, the Chained Horror is monstrous, it gains "Whenever Xadar, the Chained Horror attacks, destroy target creature an opponent controls with toughness 4 or less.
Once the Demonlord decides to unchain Xadar, the battle has already been won.