If you were a spy what wish would you pick?

What wish would be good for the MC in the Spy X Family world? Dont wont be like overpowered powers instead, like having super-soilder serum or amazing killing strength like Yor would be interesting wish. But nothing like flying powers or such.

I am still thinking of MC should reborn as Yor's brother or Loid's brother. For me I feel like its easier for him to be Loid's brother makes more sense.

Anyways I look forward to which wishes you guys make.