Borrow Fortune

Evocation
Level: Oracle * 3
Components: V
Casting Time: 1 Immediate Action
Range: personal
Target: you
Duration: instantaneous; see text
Saving Throw: -
Spell Resistance: -
  When you make a d20 roll, you may choose to immediately cast this spell to reroll that die before success or failure is known, keeping the more favorable result. For the next two rounds following your casting of the spell, you must roll two dice each time a d20 roll is called for, keeping the less favorable result.