Dumb Luck

(Complete Scoundrel, page 77, DnD 3.5)

[Luck]

You can survive situations that should kill you.

Prerequisite

Character Level 6, any two luck feats

Benefit

If you roll a natural 1 when making a saving throw, you can expend one luck reroll as an immediate action to instead trear the roll as a natural 20. You can use this feat once per day. You gain one luck reroll per day.