omgarm, I love your deck. Couple things tho: It seems to have a bit too much acceleration and not enough sinks for it. I know your trying to go with a "Off color stuff is free!" sub-theme for the Lightning/Arsenic, but I think those slots would be better served by cards that enhance your Immolation super-theme. My choices currently are 1 Phoenix and 1 Minor Phoenix (which can be cast off two Nova if you have no Photons for Immolation; or can act as a sink for the remainder of your 7 red on the first turn).
In fact, you have so much redundant acceleration, I think one Nova can be dropped. Brimstone Eater would be another guy, notably one that can be cast off one Nova and then Immolated, or he can hang around attacking for two and making future Lava Golems possible.
Lastly, and this is minor, I suspect either Forest Spirit or Giant Frog (or any of the aforementioned red creatures for that matter) are better than Forest Specter, as either of them are much more likely to hit first turn. I can suffer the 3cc for Improved Steal (stealing a Hourglass is amazing, and stealing a shield for the win is great too), and the Graboid (since it's in your mark), but a 2/3 grower is unlikely to be worth the reduction in consistency, and his average 1-turn delay from his casting cost tends to counteract the benefit his stats would otherwise give him versus Otyugh and Rain of Fire. It's "fun" to have a sink for that blue mana, but fun doesn't win games like consistency and power does.
