Niv-Mizzet, Planeswalker

+2: The next spell you cast this turn may be cast for one mana of every color instead of its normal cost.
-4: Add one mana of every color to your mana pool. This mana doesn't empty until the end of your next turn.
-20: Search your library for one permanent card of each color combination, put them onto the battlefield tapped, then shuffle your library.