attributed cards

SDS

Out of curiosity what happens if say you have a gold card 83 for example and you've upgraded his attributes +1,2,3,4 or 5 and you sell the card. Why would you sell it IDK.. I'm just wondering if a person did and say a month later they'd like to use the card again, when they purchase it does the card come back to you as attributed +1,2,3,4 or 5?
Another feature I'm surprised that isn't in there now in the marketplace is selling attributed cards.

SDS

I think they explained this on one of the feature videos. You can only sell the base card. The attributes are for you only. If you repurchase the card later then the earned attributes return.