Suggestion : Team VS Team boss fight (banner enabled)

I was thinking of a way to make banners more usable. So came to my mind "boss fight minigame" then I thought it lacked action. So I thought "would be greater if it's team VS team".
Spending too much time against adverse team handicaps the boss fight. Spending too much time fighting boss is handicapping PVP fight. Finding the perfect balance determines which team wins, getting extra points if boss is defeated.