Played on a table with actual cards - made - of - paper, this was eventually phased out while the Blizzard Powers That Be suggested that a replacement would eventually come out. (gamingtrend.com)
Sure, there are some color - coded types (where DC uses actual card types with distinct art) but that's not much of a help. (snackbar-games.com)
Actual card numbers are not stored on the device, instead, a unique Device Account Number is created, encrypted and stored in the Secure Element of the device. (dzgn.co)