So at the moment, sadly, Bant is just not as good as the separate U/W control and U/G "flash" creatures builds.
Look at what you have here for a moment. Your deck is currently fragmented between three totally different strategies.
1) Some sort of enchantment/aura build your own beater deck. Hero of Iroas, Hopeful Eidolon, Eidolon of Countless Battles, Ethereal Armor - these are all cards that you would want in such a deck. If you were to run green in said deck, it would only make sense to bring in the relevant green cards for such a deck. Namely, I'm thinking Gladecover Scout, Fleecemane Lion, Witchstalker, Unflinching Courage, and things of that nature. You would also likely want to bring in things like Battlewise Hoplite and perhaps even Daxos of Meletis. Note that given this strategy, you would almost NEVER want Supreme Verdict, nor would you need Prophet of Kruphix or Medomai the Ageless. Further, Kiora, the Crashing Wave is essentially just frivolous for said deck.
2) Some sort of Bant control deck. Supreme Verdict, Detention Sphere, Jace, AOT, Kiora, Sphinx's Revelation - these are all control cards. Here you would want to drop almost all the creature base for Aetherling and the other associated control cards. The problem being, U/W or even Esper Control are just better in terms of controlling the field and generating card advantage. Further, without Elspeth, Sun's Champion they will just beat you.
3) Some sort of U/G creature flash deck. Prophet of Kruphix is among the most underrated cards in the Theros block thus far. The ability to play it and then immediately get value if it survives into the opponent's turn makes it like a super Burning-Tree Emissary. If it sticks around for 3-4 turns, it can easily win the game for you. BUT, if that's the case, you wouldn't want to run so many auras as you cannot cast them as their bestow versions at flash speed. If you want to go such a route, you can run Kiora, but you would also want to run things like Arbor Colossus, Polukranos, World Eater, Prime Speaker Zegana, and things of that sort.
So, having said all of this, I think the best strategy would be to approximate one of the three and wait until Journey hits to see what exactly Kruphix is capable of doing and some of the other options available. If you're set on a three color deck, I do think that BUG will likely work more effectively. Sadly Bant just doesn't have the "oomph!" needed to get there just yet.
I hope this helps.