Davriel Cane

+1: Exile target instant or sorcery card from a graveyard. You may cast it spending mana as mana of any type for as long as it remains exiled.
-X: Create an X/X black Demon creature token with trample and "When you lose life, exile this creature and it deals 1 damage to you."
-7: Search your library for up to two Demon cards and put them onto the battlefield, then shuffle your library and draw two cards.