Thanks again for the response. I've purchased 3 expansions which all showed up immediately. They were all purchased from within the game. The deck pack was purchased from www.wizards.com (the maker of Magic), which I believe brought me to the x-box website marketplace. The deck pack shows up in my download queue and everything, so it knows that I bought it, it just won't show up in the game. Also, I've defeated all the enemies that unlock decks within the game. Unless there is something in the game I have yet to do to unlock these decks, but there is no indication anywhere that this is the case.