7
Blind trades
José Tavares
Set up a system where you could pair user a that needs card x with users that need card y user a has duplicates of.
In order to match equivalent cards this could be done on the schema level.
Like I want to finish base set of the ultra comix collection but I need 3 cards but have duplicates of 6 cards of the same set.
Activity
Tophinity
The best suggestions are the ones you didn't know you needed until you read it. And holy hell did you ever scratch an itch I didn't know I had.
Props to you for this idea. You've got my vote.