Luck Blade

You gain a +1 bonus to attack and damage rolls
made with this magic dagger. While the dagger
is on your person, you also gain a +1 bonus to
saving throws.
Luck. If the dagger is on your person, you can
call on its luck (no action required) to reroll
one attack roll, ability check, or saving throw.
You must use the second roll. This property
can only be used once per day.