Niv-Mizzet, Ignited

+3: The next spell you cast that targets one or more permanents has Overload {r}{u}
-4: Reveal the top card of your library. If it is an instant or sorcery, you may cast it without paying its mana cost
-14: Search your library for any number of instant and/or sorcery spells. You may cast them without paying their mana costs and copy them.