Well yes but it could be a sort of multiplayer campaign where a new one is released once a week
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So you were saying it's too like BB so here's what I thought:
About 10-20 campaigns in total (changeable)
It can use the same formula as it does to decide matchmaking to decide a predesigned base to attack
It could feature new levels of defences (not as op as before)
The difficulty could also be based on how many people there are in your clan (you must have at least 20 members to participate)
Each member gets 1 attack
At the end you kill the goblin king (cutscenes like their ads) and everyone receives a reward bonus on how much elixir they've put in to it overall. This is because everyone could do all the hard work and then the last guy drops one barbarian and finishes it off.
Lastly 2 different people cannot attack at the same time.