Spoiler warning: Anime style martial arts illusions don't get used much to the point where I question whether this is canon. Then again, I think I address this in a Q&A later, so perhaps I shouldn't make such declarations.
It's intended to be the same sort of thing Nanase did to make illusions of herself. Not technically magic because it's anime martial arts, but sort of magic? I dunno. I'm confused, too.
Incidentally, early Yu-Gi-Oh! manga? FREAKY.
Commentary added November 30, 2014