I think the Clow Cards are pretty unique. A powerful magician back home made them, combining the magic of the West and the East. They look like tarot cards but have their more physical forms too. There are nineteen of them, and they all do different things. With the Fly card, I can use that one to make the wings on my staff get bigger and use that to fly around. Or the Sword transforms my staff to a weapon. Shield is kind of obvious too, I guess....there's also the elemental ones that are probably among the most powerful.

[She's really not likely to ever actually get used to trying to explain them. Not really. But she tries?]