It's football fantasy where you own your cards and are able to win cash or card prizes for entering teams and you are able to sell cards. So when playing it right, it is possible to make a profit and even without that a ton of fun when you actually watch matches. There is also a Free2Play Mode (Rivals) where you can get some rewards.

If you like football and watch games I can highly recommend it. You need to watch out though not to lose money on it which in the end most will end up doing.