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if you win a match for example, Dota2 you get a badge you can craft them or sell them on the community market. I played 4 matches with cH yesterday (won them all) and I received 4 badges which I sold at 0.63€ each, there are, however some rare cards that go for 50-60€+ each.

To get the cards you will need to join this steam group:
http://steamcommunity.com/tradingcards/ click join the beta above.