Quite fun idea but it's too much similar too bonewall while beeing worse.
indeed, i was inspired by bonewall, the number are going to need to be rebalanced to bring it in line with the power level. possibly 3 shields gained?
I agree, it's a nice idea an 2 walls for each permanent destroyed is good enough.
But I don't agree with the element choice.
I feel it more like
since if you look at earthquake (3 pillars destroyed, + 6 walls) seems Op for me.
when it would be
you'll need a duo deck which can use it that way.
Also gravity shield isn't really good, and it's the only shield of gravity.
allready has diamond shield which owns grav shield.