This is a question I was wondering about as well otherwise you will just have to keep spending money to do anything in the game. Pumping hundreds of dollars into it to win battles isn't sustainable in the long run, for me anyway.

I would expect the possibility of upgrading cards through their use to make it more accessible. Even if it is only 1xp per win that gives people more incentive to play and build stronger decks to win and to increase card value.

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