Uncanny

You have uncanny luck that seems to kick in just when it's needed.  

• Three times per long rest, whenever you make an attack roll, an ability check, or a saving throw, you can choose to roll an additional d20. You can choose after you roll the die, but before the outcome is determined. You choose which of the d20s is used for the attack roll, ability check, or saving throw.
• You can choose when an attack roll is made against you to roll a d20, and then choose whether the attack uses the attacker's roll or yours. If more than one creature tries via Uncanny to influence the outcome of a roll, the points cancel each other out; no additional dice are rolled.