I think more crown clothes would be cool. Like almost every time you would learn a learn a new spell (not including the spells you could only get from being in that school) you could buy in a crown hats, robes, or shoes. That way if you wanted a specific card you could buy the clothe item.
KI I believe you should do this because I believe more people would buy crowns, so they can but these clothes.
Actually, it's sad to say but most people would complain that they would have to purchase more crowns to have these things. The do enough complaining about it as it is.
