I have been loving DeckBox since joining a few weeks ago and I have a few suggestions that may make it even better.

1. Show a graph of the price of each card over time on the card details page. It currently shows the current prices and from TCGPlayer which is nice, but I would also be interested in seeing the change over time. There are a lot other sites that have this type of thing so it is probably relatively simple with the TCG API.

2. Value of a collection over time. Since DeckBox is great for managing entire collections it would be really cool to see how the value of my collection is changing. This may be a little complicated since it would require a lot of resources to generate the graph on the fly or to store values for each collection on a periodic basis. Might be more trouble than it is worth, but I think it would be pretty cool.

3. Show current value of cards as they are added. When adding individual cards it would be nice to see the value as I am entering them. Currently, if I want to see what the cards are worth from the packs I just bought I have to add them and then go searching through my library. Another way to accomplish this would be to sort inventory by the date added. Then I could sort to show the most recent additions to my collections first and view the value that way.

4. The ability to see how much of each set you own. For those that want to collect entire sets it would be very helpful to see which cards from a particular set you are missing.