On the player status page, click on the promotions page. From there at the bottom, hit the enter code button. Enter each of the following codes to unlock one card per deck, up to a total of 40 cards for each deck.

Effect	Password
Promo Unlock 01	WMKFGC
Promo Unlock 02	KWPMZW
Promo Unlock 03	FNMDGP
Promo Unlock 04	MWTMJP
Promo Unlock 05	FXGJDW
Promo Unlock 06	GDZDJC
Promo Unlock 07	HTRNPW
Promo Unlock 08	NCTFJN
Promo Unlock 09	PCNKGR
Promo Unlock 10	GPCRSX