If you are playing Reignmakers to make money then it's a business. If you're playing for fun it's a hobby (even if part of the fun is making the money).
If you decide to treat it as a business then you need to track all of the money that you have gone out of pocket for in the year - every penny you put into the game. You also need to track all of the money that you made. Then you would enter the totals on schedule C in order to see whether you made or lost money over the course of the year.
If you decided to treat it as a hobby then you would report any income that you make selling the cards and whatnot but you do not get to deduct any expenses.
@Guchman
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