Here is Microsoft’s description: “Face a greater challenge in the 2013 version of this hit franchise. Play with friends or the AI, take on encounters and opponents, and face up to three other players in the Planechase multiplayer format. Featuring ten customizable decks, Magic 2013 offers game items to unlock and introduces the option to choose what lands to tap when you cast your spells.”
Remember that these titles will be available for a limited time. You can do your free purchase via the Xbox 360 dashboard or via Xbox.com. Also, as Microsoft has already moved away from Points into local currency, if you don’t have a payment option, you’ll be forced to add a credit card information even though the games are free.