Team Bonus

I'm sure it's been suggested before but, how about a damage bonus or something similar for using 3 characters of the same team i.e. x-men, F4, Avengers, Guardians etc. It would entice people to collect characters they didn't want or have before. You could expand these teams with different types of team incentives like an all Villain team or all female team or classic character team..etc....just a thought.