Pyramid Head, the Executioner

When this creature deals damage to another creature, it gains -1 -1. If it's power and/or
toughness is already at one, sacrifice that creature and Pyramid Head gains +1 +1.
_________________________________________
A sadistic and merciless executioner, intent on
dispensing pain through punishment. Where he tread,
even monsters fled for the shadows, and those who
crossed his path fell victim to unrestrained acts of aggression.