Why havent I seen this?

Im not sure, but i dont think ive seen anyone try this: An item based spell system. You can use triggers and items to make spells. Also, since these are items, you can drop, trade, and buy new ones, as well as have as many as you want. I have a sample of what i mean, its an RPG i started that uses an item based spell system, a random battle system, and a trigger based experience system. It also allows you to hold up to 18 items by hitting Esc which scrolls through three "pages" of items.

Well, it has been done, but the problem is that it isnt practical. 6 item slots limits the amount of spells, and they take up space for attack and such items.

I set up some triggers that when you hit Escape it scrolls through 3 different pages of items allowing over 6 items. (18 right now)

Oh, well that actually has been done before too :P. Im not trying to be an ***, im just telling you. But this is useful if you do wanna use items like this.