This is a key feature I have found lacking in all card inventory programs I've tried.
If one could mark a deck as "fantasy" or "real", the cards from the "real" decks could be tracked as "used" in the collection(s). Of course, if multiple collections are implemented (please!), "real" decks would have to be linked to the appropriate collection.
Users could share deck builds by exporting their "real" decks as "fantasy" decks before sending to friends.
... Or a filtered set thereof. There are times I would like to know the approximate value of some group of my older cards.
I would greatly appreciate this feature. I would then be able to inventory my children's collections.
Agree with this suggestion. These are the two resources I use exclusively.