Lucky (3.5e Equipment)
From D&D Wiki
A lucky weapon grants good fortune with its use and to its possessor. Its wielder gains the extraordinary ability to reroll one of the weapon’s attack rolls, once every minute. The result of a roll must be taken, even if it is less than the original. The weapon’s possessor also gains a +1 luck bonus on all his saving throws. This property cannot be applied to ammunition.