Here are the promo codes in Magic: The Gathering Duels of the Planeswalkers 2014. They unlock ten great cards in each deck. It is recommended to aquire these cards before starting campaign because they can really help if you incorporate them into your decks.
To enter the codes, go to the main menu and select "Extras". Then select Promotional Unlocks, and enter the below codes to unlock the cards.
Code # - Promo Code
Promo 01 - GKSNDR
Promo 02 - DWNNDR
Promo 03 - FTHPTH
Promo 04 - TRCKSC
Promo 05 - PRSTTT
Promo 06 - RSNGSN
Promo 07 - XBXBDZ
Promo 08 - PXPRMD
Promo 09 - MGCCTN
Promo 10 - JRHPRD
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