So I thought of something that may not be liked by all but would change the game…    

so before you can save a defense as your defense you must first 100% it.    (No gems)

It would definitely make a lot of people rethink their GK and if your capable of beating your immortal statue then you should keep it impossible for anyone else.   

I cant beat my GK anymore so it would effect me.


My suggestion to possibly defeat the OP GK without nerfing it is via a turned-base mode, as it involves strategy, not just bashing: