I would actually focus more on instants. Prowess and heroic work better as a surprise with combat tricks.. And that way its harder to two for one you
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If theyre supposed to come out with starfield of nyx.. how? You have no discard tech or way to get them into your graveyard, and no forests to cast kruphix's insight at all. why only plains? XD
How.... do you cast the green spells?
No problem. Suns is Ok. I dunno, I'm leaning towards comet storm, as a finisher, but it seems like you dont plan on going THAT late. Part of me also thinks you might wanna splash a couple green dual lands for clan defiance, cause its a fantastic x spell too, but thats going in a different direction. Fireball's aside, you have a LOT of low cost burn. Past in flames is an option too if you stall out.
I'd say incinerate over lightning strike, its not a big deal but i think you'd prefer to have the optional utility of the extra text. Also, have you considered Slagstorm?