Some decks do not have recognizable titles on the tuck, and even the ones that do are sometimes difficult to identify by title alone. Which version are they? Which print run? And what about all of the pesky details like who the author is, the manufacturer, the company who hosted the design, and the print date?
I think it would be awesome to have an Identify option where you can see the front and back of the tuck box and one of the court cards of registered decks (the ones that have been listed on the site) in sortable and filterable list to help you identify the deck you're looking at. This would require that detailed information on each deck be entered, so this feature may take a very long time to implement in full, but I think it would be well worth it as a collector resource, especially for those who are seeking to trade but may not know exactly what they're being offered.
I have been using the Discover feature for this to this point, and it really is not an intuitive option. There may be other resources for this out there that I am unaware of, but I think it would be ideal if you could turn Portfolio52 into an all-in-one card collectors' resource.