Breznag, Hunter of Heads

Whenever Breznag, Hunter of Heads enters the battlefield or attacks, target creature gets -X/-X until end of turn, where X is the number of orcs you control.
You may exert Breznag as it attacks. When you do it gains deathtouch and menace until end of turn.
Blood, life's red messenger, sings to him of sorrows and of slaughter.