Rootborn defenses is better than brave the elements against things like Supreme Verdict plus you get to populate your tokens. Selesnya Charm x4 is a must in this deck.
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I have almost the same deck which I've been playin on MTGO with good success, it plays good against Mono-Blue and ok against Mono-Black and U/W-control, check it out http://www.mtgvault.com/kvasir77/decks/devotion-to-keranos/
This deck would benefit from Young Pyromancer and Mizzium Mortars, i would also move skullcrack to the sideboard. I have a similar deck which i've been playing successfully on MTGO http://www.mtgvault.com/kvasir77/decks/izzet-midrange-control/