Nero, Channeler of Chaos

+2: Look at the top 4 cards of your library and put any number of them in your graveyard. Put the rest on the bottom of your library in any order.
-2: Destroy target creature. Create a 1/1 black spirit creature token with flying.
-6: Until end of turn, you may cast instant and sorcery spells from your graveyard without paying their mana costs. Exile each spell cast this way.