Ashiok, Opulent Incubus

: When Ashiok is put into your graveyard from your library, put it onto the battlefield. Its loyalty abilities cost an additional -2 loyalty.
+1: Target opponent may sacrifice a creature. If they don't, create a tapped Treasure token.
-X: Exile target nonland card from a graveyard with mana value X. You may cast that card for as long as it remains exiled.