The Sacrilegious Abomination

Flying, shroud, vigilance, lifelink, trample
The Sacrilegious Abomination's power and
toughness are equal to your devotion to white
and black.
At the begining of each player's upkeep, that
player sacrifices a creature.
Angels and demons cost {x} less, where X is equal
to your devotion to white and black.