Quite fun, overall.
I finally got my hands on some more hero coins, and got another 2 cover slots. Right now I have:
Spider-Man (Classic) - 3*, only has the blue move.
Storm (Modern) - 4/4/1, level 31
Iron Man (Model 35) - 4/3/2, level 20
Thor (Marvel NOW!) - 0/1/1, level 17
Spider-Man (Bag-Man) - 1/1/1, level 15
Wolverine (Astonishing X-men) 0/1/0, level 15
Black Widow (Modern) - 4/5, level 7
I also have the ability to recruit a Red moonstone (Dark Avengers Ms. Marvel), and a Blue Hawkeye (Modern).
Any suggestions on what to ditch for what? I don't do IAPs, so I don't know what I have the best chance of getting more covers for.