Who to rank up.

ThatOneMasterGamer

I my luck with 5* has changed recently changed and I don't know who to take up (I can for now only take any up to rank 4). Archangel is the only one duped and he's at sig 1, used a gem as soon as I got him.

ThatOneMasterGamer

I can also take up Thing, Magneto or Hulkbuster.