Mulligans
Got 59% winrate after 37 games with this deck, so it’s okay at least for now. I doubt that Spell Damage Mage will be that good once the meta settles though.
Kelthuzad is good to combo with Combustion and Rolling Fireball, especially if you got some Spell Damage on board. Even with Arcane missiles you can sometimes summon some pretty good minions.