This deck looks like it could be hilariously fun, just spitting out huge dragons and hitting hard. I don't think you have enough Red mana-ramp though. Might I suggest Tinder Wall, Bird of Paradise, and Harabaz Druids? And for lands, I would suggest Rootbound Crag and Copperline Gorge, maybe Kazandu Refuge as well. Also, the planeswalker Sarkhan the Mad would be so perfect here if you could find a way to fit in that one black mana, which Birds of Paradise or Harabaz Druids could do.