Lucky

You have inexplicable luck that seems to kick in at just the right moment.   You have 3 luck points. Whenever you make an attack roll, ability check, or saving throw, you may spend 1 luck point to roll an additional d20. You can use this ability after the original roll, but before the outcome is revealed. You choose which of the d20s is used for the attack roll, ability check, or saving throw.   You can also spend one luck point when an attack roll is made against you. Roll a d20, and choose whether the attacker's roll uses their d20 roll or yours.   If multiple creatures use a luck point on the same roll, they cancel out, resulting in no additional dice.   You regain expended luck points when you finish a long rest.