ANSWER - When you say mythical spells - are you referring to spells that would actually transform a human into one of these mythical creatures? If so I am afraid (once again) I have to be clear that no such spell exists. I have spoken previously and very recently about vampires, mermaids belong in the realms of fiction, Werewolves are the product of a disease called lycanthropy and although the world of faery certainly exists there is to the best of my knowledge no spell that will transform a human into a faery.
I'm reluctant to shake your belief because I think belief is a powerful and positive tool that sets humans with the capacity for imagination and the willingness to transcend the mundane apart from those who follow empirical evidence blindly and accept nothing but that which can be proven. But equally it would be wrong of me to foster a hope that I genuinely believe is founded in the impossible.