Afraid you can't re-earn them. You earn half the total amount of available cards and then trade for the other half. You also earn booster packs for games which contain 3 cards or something. I think that 1 booster pack is released every time someone completes a set if cards. The pack is then randomly given to someone that has logged in in the last couple of weeks (not sure if you need to play the games or...)
Ok i see i'm not fussed about them to be honest if you can only get half from the games then i'll probably just sell them. Also is there anywhere you can see whether you have collected all you can from the game?
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