You could coat your fingers with infrared ink. Each card would naturally have a different pattern imprinted on the back depending on how you touched it.
How would the mapping from random pattern to card be established?
Well there's the rub. It's certainly technically possible if the device described in the article is. Tagging the cards with "smart dust"[0] might be easier, and harder for the casino to detect.
Except that smart dust does not exist. That Wikipedia page needs to be rewritten. It's vague and misleading.
s/smart dust/very small RFID chips/g
There is a reason RFID chips are the size they are. The smaller they are the closer the scanner has to be to energize their antenna. Either that or you increase the power but the power needed goes up exponentially with distance. I don't see this working. At least not with today's tech.
Through play. Camera would need to recognize card type from capture of card face up. This plus the back of same card would link the unique signature and the card value.