Pretty epic and fun. Free download. Collect Marvel cards, battle vs others with app from across the world, collect, go on missions, etc. Should definitely give it a try.
There's a code to use after the tutorial that gives you a good card to start with and some money.
So when you see 'referral code' just enter this. Gave me a hell of a start.
dky608934
If enough people play, we can build our own alliance [like a club] and do shit.