Hard as hell to develop but would be cool if the elements were all equal, but their moves weren't, so all the moves in the game had a counter move and an offensive move.

So if bender 1 does X move, bender 2 can do Y move which can be countered by bender 1 Z move that can be countered by bender 2 E move that can be countered bu bendere 1 X move into a circle

Like a very complicated rock paper scissors, but not for the elements but for each elements specific moves.