All creatures on the battlefield are black in addition to their other colors.

If you would sacrifice a creature in order to cast a spell or activate an ability of a permanent you control, you may sacrifice a black creature an opponent controls, even though you do not control it. You may only sacrifice an opponent's creature once per turn this way.

During each end step, the turn player creates X 2/2 Black Devil Torment creature tokens, where X is the number of creature permanents that player sacrificed this turn.