I really hope I'm not being rude but this is really irking me.
You cannot transform into a mythological create or animal.
That means: A were-wolf, a mermaid, a fae/fairy, a dragon, etc.
You cannot use magick to altar your physical form and DNA. No you cannot grow a mermaid tail. You cannot grow wings. Magick in reality isn't like what you see in movies, cartoons, and anime.
Somethings are impossible, however, if you wish to believe you are a mythological creature then go ahead. :P
I just really needed to get this off my mind. Plus seeing so many "transforming" spells in categories that aren't fantasy really annoyed me. I hope no one was triggered by this and I hope I posted this in the right spot. :)