Niv, Living Guild Pact

0: You may pay {w}{r}{g}{u}{b} instead of the mana value for spells with Mana value 5 or greater
-3: Add {w}{r}{g}{u}{b} you may only use this mana on spells with a mana value of 4 or less.
-7: Create a 5/5 dragon token named Niv Mizzet Parun, with"Whenever you draw a card, Niv-Mizzet, Parun deals 1 damage to any target."