Your deck is already very good; however, you could benefit from 2 Prophet of Kruphix as they are quite versatile, and allow you to play creatures on the opponents turn as well just to make them think a little bit more about what they are going to play. Also, Prophet of Kruphix allows you to draw cards on their turn with Temur Ascendancy!!!

Thank you seanfireball2 for the feedback! The problem with Prophet of Kruphix is while she's very good and fits well in this deck, it's a matter of what's better. What do you take out? Stormbreath Dragon ? Polukranos, World Eater ? Is she better than either of those cards? Is she better than our new KTK beasties Savage Knuckleblade or Sagu Mauler ? I don't think so. So do you dip into the ramp? Or card draw? Her problem is that her inclusion means the deck loses synergy. She might be a good sideboard card against aggro, but otherwise.. I can't justify making a spot for her, you know?