Fox's Cunning(Player's Handbook v.3.5, p. 233)
Level: Trapsmith 1, Bard 2, Emissary of Barachiel 2, Spellthief 2, Artificer 2, Jester 2, Sha'ir 2, Vigilante 2, Fatemaker 2, Ebonmar Infiltrator 2, Wizard 2, Sorcerer 2, Urban Adept 2, Merchant Prince 3, Baator (SpC) 2,
Components: V, S, M, DF,
Casting Time: 1 standard action
Target: Creature touched
Duration: 1 min./level
Saving Throw: Will negates (harmless)
Spell Resistance: Yes
The transmuted creature becomes smarter. The spell grants a +4 enhancement bonus to Intelligence, adding the usual benefits to Intelligence-based skill checks and other uses of the Intelligence modifier. Wizards (and other spellcasters who rely on Intelligence) affected by this spell do not gain any additional bonus spells for the increased Intelligence, but the save DCs for spells they cast while under this spell's effect do increase. This spell doesn't grant extra skill points.
Arcane Material Component: A few hairs, or a pinch of dung, from a fox.