Wren's Run Packmaster would be so good in this deck if you wouldn't have to champion an elf. Dammit!
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I would also add Negate
What about Counterspell instead of Cancel?
What about Nova Chaser?
What about Sol Ring, and Temple of the False God? I suggest.
I suggest also Dragon Fodder, check it out, it's just the same as Krenko's Command.
Why Scalding Tarn? Just makes you lose a life. I suggest a Basic Mountain instead.
Aether membrane and Heat Stroke don't work really well together, you are going to destroy your wall and save the blocked creature. Tribal Flames is stupid if you just have one type of basic land (mountains). The mana cost of your cards is not too high, so Undying Flames is not going to be as effective. All the cards with X on its mana cost are going to be useless if when you cast Chandra's -7, because X becomes 0 (you haven't paid any mana to cast it). Hope I helped you :)
What about Elvish Piper? I think it's perfect for this deck.
I feel like you need more counters.
I relly like your idea for Fire Temper, I was looking for a card with that kind of use. Thank you :)
You could add Lightning Bolt instead of Shock