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My step kids have started taking a liking into it. As long as they use their own money to buy card sets, I'm fine with it. It is expensive sometimes to play, depending what cards you're looking for, but I see it as a fun way for them to learn English (they're French-Canadian).

That's actually very good idea. I tried getting my boys into collecting cards like pokemon but all they do is slobber all over them and throw em around the house. Cards can end up being a very expensive hobby.