Niv Mizzet, Mindblaze

+2: Draw 2 cards, Niv-Mizzet Mindblaze deals 2 damage to target opponent
-1: Niv-Mizzet Mindblaze becomes a 7/7 elder dragon creature with flying unti end of turn, prevent all damage that would be dealt to him this turn
+8: Shuffle all instants and sorceries in your graveyard into your library