Dr Strange is the one who calls magic the Mystic Arts, yes?
I thought I had a decent understanding of the Related Worlds, but with all these other multiverses and world-travelers, I fear I know very little. I do believe, despite the variances in terminology, that is probably some overlap, and not nearly as many additional worlds as it seems, but I haven't had much time to start cross-referencing yet. Have you looking into the matter at all?