Morbid Offering

As an addition cost to cast Morbid Offering, sacrifice a creature.
Look at the top card of your library equal to the sacrificed creatures mana cost. You may reveal a creature card and put it onto the battlefield
under your control, put the rest on the bottom
in any order. You lose life equal to it's power.
"Being a master of dark arts, repercussions are not of any concern." - Queen of the Underworld