Zoa, Mana Chieftain

+1: Put a colorless artifact token onto the battle with: Sacrifice this artifact, add one mana of any colour to your mana pool. Draw a card.
0: Add X mana of any color to your mana pool, where X is the amount of unspent mana in your mana pool.
-6: You get an emblem with: you may cast cards from your hand without paying there mana costs. If you cast a card with X in its mana cost, X=10.