Evening out my card pool

Hi friends,

So I am a new player and have recently started collecting. I have mainly bought the heroes based on what I like from the comics/movies, and also bought a few just because they are cheap to expand my card pool. So far apart from the core I have Angel, Gambit, Rogue, Nebula, Deadpool, Venom, and the Mutant Genesis box. I’m not sure why but it seems that the majority of heroes I have have come with either justice or protection precons, so I now have a ton of those cards and very little aggression or Leadership.

So my questions are:

  1. Are the aspects even over the whole collection?
  2. What can I buy to even out my card pool? I am interested in mainly x-man and guardians theme wise, although I have so far avoided the guardians box as everyone says that groot is the worst hero.

Thanks!