Random Magic Weapons (any level)

A weapon of speed allows the wielder one single extra attack each round at his highest bonus. It is not cumulative with haste. The extra attack must be with this weapon, not with some other weapon. The weapon does not grant the benefits of a haste spell, so an additional partial action is not what is granted, simply an extra single attack with this weapon.
Aura: Moderate transmutation
Caster Level: 7th
Requirements: Craft Magic Arms and Armor, haste
Price: +4 bonus
Source: Dungeon Master's Guide v.3.5