My biggest recommendation for you is to focus this deck PRIMARILY on Zendikar. This way you can get the token/
rally support that you'll need. Adding
retreat to emeria will allow you to pump out ally tokens and
evolving wilds will give you land drops for extra effects. Pull
Ob Nixilis reignited to the side board and focus more on Gideon, Nissa and Sorin. If you don't plan on attacking much then add the allies that have the COHORT effect and if you do plan on being offensive then use the allies that give your creatures first strike, double strike, trample, and/or indestructible. Just some ideas that I thought might help focus more on the creatures and planeswalkers rather than just the colors. What are your thoughts on this so far?