Fortune 2014

2nd-level abjuration

Casting time: 1 reaction, when a creature you can see within 60 feet fails with an attack roll, an ability check, or a saving throw
Range: 60 ft
Components: V
Duration: instantaneous
Classes: Bard, Sorcerer, Wizard

You magically reshape causality for the triggering creature, positively influencing its efforts. The triggering creature must reroll the d20 and use the higher roll.

Source: Spells That Don't Suck (Somanyrobots) · License: Creative Commons Attribution 4.0 details