Kami

Kami are "great spirits", specifically the spirits that associate with all things in the world of Kamigawa. They come in an overwhelming variety of forms, even among the same "species" of kami, and their brand of magic is mysterious and beyond anything mortals have concieved. The greatest kami of all are the five myojin, rivaled only by the mighty O-Kagachi. It was because of an upset of O-Kagachi that the Kami War took place in the first place.