And having a defense that is floating in the air attacking ground only troops is any different than having a full barbarian army and attacking someone who has a dragon or minions in their clan castle?
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here's my addition for what its worth:
maybe if you had it designed like a balloon like structure tethered to the ground the rope could have fairly high health depending on level? and if the rope is cut then the balloon falls to the ground for ground troops to ravage??