They are going in order from first to last cant you tell? Im pretty sure theyl add a goblin emperor before a wizard king. If they do add a goblin emperor it should attqck all buildings but deal 2x damage on recource structures.
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I like this.
It is a smart idea. I think there should also be a cool down time for switching between 2 heroes.
Maybe even a small price of 120 coins or so.