I think SE is fantastic the way it is, and doesnt need a change!
But, if your going to anyways:
This is a TCG right? We should have a general marketplace AND a player run marketplace where you can list your own cards for sale or trade.
Update the user interface to allow more search-ability in the marketplace and deck construction.
A more comprehensive deck construction ability, more slots per Hero so we can save multiple decks.
For PvP, instead of just "create game" maybe change it to "free game" and "tournament". The "Free game" will stay exactly as it currently is. "Tournament" will give each player a 25XP bonus, becuase technically, you are gaining experience everytime you play competitivly, and I look at the "Free game" as just testing decks and whatnot.
THats about all I can think of for the moment
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