Thanks for all your feedback! I'll keep experimenting with this deck and let you know how it performs.
Go for it, but I'd remove a pyromancer and Forked Lightning for 2 Argent Commanders or other Charge minions. You can also go for another Lava Burst just for damage instead of minions.
Edit: Sorry forgot to say why, having 2 pyromancers seems a bit excessive and Forked Lightning because of the 2 overload.
Like I said before, feel free to tweak it according to your playstyle. This is experimental deck more than anything, I'm pretty sure I'll make changes as I go along. Forked Lightning is bit of an experimental card, but if you treat it as double Lightning Bolt (when Spell Power -boosted or Wild Pyro'd) it starts looking more lucrative.
Reason I picked 2 Wild Pyros as opposed to, say, Kobold Geomancer or Thalnos, is extra synergy with spells (explained in Hearthpwn deck description): When paired with Stormforged Axe, Wild Pyro + any spell is usually enough to carry me through early game even against aggro.
Most importantly, Wild Pyro's effect is one of the easier ways to enrage Spiteful Smith (Wild Pyro + Rockbiter -> Spiteful Smith takes 1 Damage and nets +2 Atk for Doomhammer on top of Rockbiter), which I sorta consider as one of my win conditions.
Still, if you find 2 Pyros excessive, tweak your deck accordingly.
I'm bit hesitant to add more 6+ Mana minions, with Shaman's card draw & Overload I'm not comfortable stacking too many expensive minions in my deck (I tried Auctioneer and got mixed results, decided to go with Azure Drakes due to consistency and Spell Power -boost).
If I were to swap one Pyro, I'd probably try Arcane Golem (cheap 4/2 Charge), Sunfury Protector (for added Taunts) or Lava Burst... maybe Thalnos, but I'd debate whether card draw Deathrattle is better than "Whirlwind after any spell" or not.