Wizard spells that improve natural attacks

[Yogibear41]

Are their any wizard spells worth learning/using that improve natural attacks?

[RolandDeschain]

Blood Wind comes to mind, but I don't think it "improves" natural attacks in the manner your suggesting...

[The Trickster]

Enlarge person will increase the damage of unarmed strikes by one die level.

Fist of stone is a spell that also gives an unarmed strike, an extra strength to boot.

[Urpriest]

Mighty Wallop and Greater Mighty Wallop are excellent for bludgeoning natural attacks (which includes bites!)

[Yogibear41]

I always wondered if you used something like magic fang, or in this case mighty wallop on a paired natural weapon, in this case something like wings or paired slams because of bludgeoning, but also claws normally. Do you have to cast the spell once for each claw/wing/slam or would one casting affect both of them since they are the same natural attack(well sort of)