Fire Wizard

Fire Wizard: Variant PHB Wizard (Arcanist).  +1 dmg/die on fire spells, -2 dmg/die on cold spells.
Arcanist Wizard: http://wizards.com/dnd/Article.aspx?x=dnd/dra/201107wizard

Wizard Fire Spells, Heroic Tier
Scorching Burst base damage > 1d6+1
Burning Hands base damage > 2d6+2
Flaming Sphere base damage > 1d4+1 enters/ends turn adjacent, 2d6+2 attack (can charge)
Fire Shroud base damage > 1d8+1
Fireball base damage > 4d6+4
Fire Burst base damage > 3d6+3
Wall of Fire base damage > 1d6+1 adjacent, 3d6+3 within wall