Click on 'Promotions' at the 'Player Status' page and select 'Enter Code'. Then input the following case sensitive codes to unlock one card per deck, up to a total of 40 cards for each deck.

Promo Unlock 01:
Enter WMKFGC

Promo Unlock 02:
Enter KWPMZW

Promo Unlock 03:
Enter FNMDGP

Promo Unlock 04:
Enter MWTMJP

Promo Unlock 05:
Enter FXGJDW

Promo Unlock 06:
Enter GDZDJC

Promo Unlock 07:
Enter HTRNPW

Promo Unlock 08:
Enter NCTFJN

Promo Unlock 09:
Enter PCNKGR

Promo Unlock 10:
Enter GPCRSX