I think my favorite idea for a superpower would be an ability that makes you super itchy whenever you tell a universal lie. While this would at first be an extreme inconvenience, imagine taking a multiple choice test. You could test each answer to see if it makes you itchy, and if it doesn't you choose it. Extended to a superhero, the power would be s-tier in hunting down villains or solving missing peoples cases since they could use their powers in a binary search type way to quickly narrow down their latitude and longitude. They could use their powers to test potential strategies for a league of other superheroes, and pick the best one each time. Since their power relates to universal truth, they could also develop scientific knowledge far beyond our current level, because they have no need of actually running experiments. They just need to sit in a room with a box of baby powder for when their itching gets too unbearable.
Basically, their ability is to ask the universe as many yes/no questions they want, it's just that this ability is slightly nerfed by the fact that if the answer is "no", they get itchy.
Extend this ability to allow them to turn on an internal mode, so that when they choose to use it, they get itchy when their thoughts are wrong too. Since you can think much faster then you can speak, this could allow the user to even use the ability in combat by occasionally predicting their opponents moves. The ability could also allow you to share it with others, which could be used to incapacitate some villains and also be used in interrogation.
What are people's opinions on this/ what clarifications could keep the power from becoming something that I obviously am not trying to describe? Also, are there any other potential uses or interesting modifications for this power that I have missed?