not over powered but making the wall breakers useless and upgrading walls useless to. if a giants distract the defenses you could us one of these to get in to any level walls.
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This idea is called a Wall Breaker!
Well remember, it can only do the same amount of damage as a regular wallbreaker, but it could drop a bomb on the same wall until it reaches it's limit if it can't break it with one hit. So, it would still help to upgrade walls, but I suppose that is true to some extent. It goes both ways.