anyone know where to find a free online trading card game?

i am a huge fan of some trading card games, i love mtg and have played the version for xbox,pc,ps1 and 360. however i ran into a game today called warstorm, i like it but i cant afford to pay for the extra cards and you cant get to far with the ones your given. are there any online tcg's that i can play for free but unlock my cards thru gameplay instead of dishing out money for

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