Diviner's Trophy

Cast Diviner's Trophy only if you destroyed a nonblack creature you don't control this turn.
Nonblack creature spells your opponents cast cost {2} more to cast. Any player may pay 2 life to ignore this effect until end of turn.
Whenever you cast a black instant or sorcery spell, sacrifice Diviner's Trophy: You gain 2 life for each creature card in target opponent's graveyard.