Hth, Prismatic Apprentice

+1: Until end of turn, you may spend colourless mana as though it were mana of any color.
-1: Reveal the top card of your library, if it is multicoloured, you may add it to your hand.
-6: You may choose a colorless card you own from outside the game and reveal it. Until end of turn, you may cast it without paying its mana cost.