Something more than a "Unique Battle System" that is nothing more than twirling your elemental wheel to best fit the situation.
Offense, Defense, it is interesting in theory but it's not interesting enough to stand on it own.
Something as basic as say BLM gets a boost to Ice spells if they have 1 magicite in ice. So a BLM may feel compelled to "lock in" a magicite to Ice so that when their board rotates the ice magicite will always remain.
The system we have currently is just big numbers and more big numbers, a lack of a trait system or something to add some customization flavor to the area is what makes it lackluster currently.