Players new and old seemed to enjoy it. I think with some more streamlining and a rehaul of the Major Arcana points, it could be marketable.
I even had a momentary vision of a 'league'. Perhaps souls would have in-game 'always on' effects, making them more valuable (and making sales of them more interesting/lucrative). Better players would soon amass a storehouse of souls. Better players would also improve their Major Arcana rank. At a league-sanctioned event, they could choose which soul (only one) to wager at the game. Step 3: profit.