even if we
forget about the commander, how shall he pay for the dinosaurs? cmc of 4.5+ but only 31 lands and just 7 additinal cards for ramp/fixing.
besides that, I suggest using
Gishath, Sun's Avatar as commander. It doesn't break the tribal idea and has synergies with many other cards in the deck. Besides that, you've got, at least in it's current state, just 4 cards that would have to be replaced by reducing the colors.
about the recent changes, what about
Disenchant in stead of
Disempower?