+1: Create a 3/3 Kavu creature token with trample that's all colors.
-3: Choose up to two target creatures. For each of them, put a number of +1/+1 counters on it equal to the number of colors it is.
-6: Return target multicolored card from your graveyard to your hand. If that card was all colors, draw a card and create two Treasure tokens.
Jared Carthalion can be your commander.