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 Rare card to start with and a lot of money.
So when you see 'referral code' towards the end of the tutorial just enter this. Gave me a heck of a start.
If enough people play, we can build our own alliance [like a club] and do some cool things.
If you need to see it online before downloading it on your phone, here is the link above.
It's a fun game.. you're missing out!