Quote from Honor Basquiat »Really cool list you have here. I believe your mana curve is too high, especially for only running 36 lands. I think you should consider cutting cards like Emmara Tandris that don't do enough for the mana you have to invest.
No Intangible Virtue? Mana efficient mantra ability + vigilance and is on theme seems like an obvious inclusion. Any particular reason you aren't running it?
Raise the Alarm is another very efficient spell and is instant speed but I notice you aren't running it.
Heroic Intervention is a recent addition from Aether Revolt that seems very worth of consideration and is great technology to answer destroy board wipes.
I recommend making room for Nature's Lore. It can fetch a Forest like Rampant Growth but bring it into play untapped. Additionally is can search for Canopy Vista and Temple Garden.
Also you seem to have very little card advantage and limited spot removal. I strongly recommend you make room for Sylvan Library, Path To Exile, Council's Judgment, etc.