Magic Fang, Superior

(Spell Compendium, page 136, DnD 3.5)

Transmutation

Level: ; Druid 4; Ranger 4
Components: V, S
Casting Time: 1 standard action
Range: Personal
Target: You
Duration: 1 round/level

You speak the old words of the incantation, and your hands glow with a yellow aura that flashes at the tips of your digits.

Superior magic fang gives every natural weapon you possess an enhancement bonus on attack rolls and damage rolls equal to +1 per four caster levels (maximum +5 at 20th level).