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From Pathfinder Core Rulebook, which isn't enabled.

Luck Blade

ITEM 17
RAREAGILEDIVINEFINESSEFORTUNEMAGICALVERSATILE-S
Price 15000 gp
Usage held in 1 hand
Bulk L
Category martial
Group sword
Damage 1d6 piercing

Luck and good fortune bless the wielder of this +3 greater striking shortsword. Luck blades are crafted in a variety of styles, but their hilts or blades always incorporate symbols of luck, such as clovers, horseshoes, fish, ladybugs, or other symbols.

Activate envision
Frequency once per day
Trigger You miss on a Strike with the luck blade
Effect Reroll the triggering attack roll and use the new result. This is a fortune effect.
Pathfinder Core RulebookOGL