Well, only kind of hexadecimal, since F is never the last digit and the first digit proceeds up into...I think W? I'm sure there will be some guessing on matching up the images, since some of the cards don't have numbers (Grass Strider, Andro Gear, etc).
After a long hiatus, I blitzed through the item and spell lists. These are now also available. The searching syntax is as arcane as ever, but the help file should be comprehensive enough. I also added the option to enable images, since downloading the images can take a huge amount of time.