Was suggested to make a forum post on this idea.
In short, what if there was a menu that showed you account-wide, what cards you’ve found? Something to do, like Diablo 2’s Chronicle tab. It wouldn’t be actual storage it just shows that you’ve found said card before.
To prevent manipulation, it should only count when you yourself find one, so you have to get it the hard way.
I would also say, if this idea were extended, an item grail would be good too, like finding all rare gear that’s possible to find, et cetera et cetera.
I have more than a few reasons why I think this would be cool but I don’t want to clog anything up.