You could replace Skygames with Aqueous Form. Costs one less, you don't have to tap a land for it, you can scry whenever you attack with the creature and being unblockable is better than having flying. If you put that on Qal Sisma Behemoth, he's gonna hurt your opponent. You might also want four copies of Monastery Swiftspear, it's just that good of a card.

Thanks, Memphismaymagic5. I decided to take out Lightning Beserker for the other copies of Monastery Swiftspear. Originally I had favored including Lightning Beserker for a dash-able flying creature that I could pump late-game for that extra bit of damage, but I think that this deck has more spells it would rather cast with that firebreathing mana by that point, and Monastery Swiftspear is one of the few creatures in this deck that would be useful in a defensive situation. As for Aqueous Form, I like them as an easier alternative to Skygames, especially if I get to scry; however, I think I'll keep a couple of Skygames, as Skygames is flexible, applying to whichever creature I need at the time, and less susceptible to creature removal.