Being able to shoot golden balls out of your chest. Or that one mutant that just has a long neck. Think of all of the possibility they could accomplish, the thing they can do. Jk, what ^said plus magic, although magical power scales differently with each type/wielder. Just about everything in the Marvel universe is connected to some sort of magic. The potential is quite limitless, as we see when something like The House of M storyline plays out. Rewriting reality as we know is quite a powerful force, as mentioned^.