Random Magic Weapons (any level)

Weapons with this ability are sometimes bestowed on adventurers favored by the church of Tymora. Typically, each is created with 7. charges. The wielder can spend 1 charge on his turn (as a free action) to make an extra attack with the weapon. She can also use 1 charge at any time, but no more than once per round, to reroll any die. The wielder can decide to spend a charge to reroll a die after learning the result of the original die roll.
Aura: Strong transmutation
Caster Level: 13th
Requirements: Craft Magic Arms and Armor, limited wish
Price: 38,500 gp; Cost 14,000 gp + 3,220 XP
Source: Player's Guide to Faerûn