Interesting to see how other people organize various collections.
Since I treat my Mage Wars as one growing set, I have them in binders in 9 pocket sheets. Organized with subject tabs dividing first the major schools in alphabetical order, and then the minor elemental schools plus the mixed school cards. And within each of these tabs, they are divided into Equipment, Creatures, Conjurations, Enchantments, Incantations, and finally Attack spells. And within each of those segments they are alphabetical.