The problem with such spells is that they stretch beyond the realm of incredibility and break the natural laws of nature and the physical.
Magick, and thusly spells, are work in the unseen, manipulating the mind and "pulling" the strands of fate, so to speak.
Divination itself isn't magick, but instead is simply access to information from elsewhere. Some believe this is merely local (archetypes the mind finds), others believe this information comes from the universe, the will manipulating the strings of fate, or from spirits.
This doesn't break the laws of nature. You have people who actually get results, good enough that these methods of divination have been around since god knows.
As for a spell to grow wings, you will never find someone who achieved that. Nor would any person from the time before hollywood think such a thing possible.