For PFS, Practiced Diplomat: "Circle one of the following skills: Bluff, Diplomacy, Disguise, or Knowledge (nobility). When you roll your chosen skill, you always receive a result of at least 10 plus the number of goals you have completed."
That seems amazing. With just 2 goals completed, you are guaranteed a roll of a 12. Once you get 7 goals completed, you are guaranteed a 17.
I can see it being hugely beneficial to have on a diplomancer, as you could never mess up a roll.
I could also see someone who makes use of feint to get good mileage out of it. Or even a vigilante, to make sure that he always makes his disguise checks.
What class would make the best use of this ability? Bonus points for the character to make a believable noble.