Instructions
Scroll to the "Game Marketplace" section on your Xbox 360's main menu.
Select "Explore New Games."
Scroll to the "Titles A-Z" tab and select "M."
Select "Magic the Gathering" from the alphabetical list shown. Select the "Extras" tab.
Select the expansion pack you wish to download. They are listed as "Expansion Pack 1," "Expansion Pack 2" and "Expansion Pack 3."
Select "Download." At the time of publication, each expansion pack cost 400 Microsoft Points. The expansion pack automatically installs after downloading.
Launch "Duels of the Planeswalker." Upon launching the game, all downloaded content is available to play and browse from within the game.