You have extremely good (and bad) luck at times resulting in at times farfetched levels of competency and incompetency. Whenever you roll an ability check or saving throw choose up to 2 number(s) from 10-19 (minimum 1), when you roll the d20 treat these numbers as a roll of 20 on the d20. Correspondingly choose an equal amount of different number(s) from 10-19, when you roll the d20 treat these numbers as a roll of 1 on the d20.