Microsoft has just announced the two free Games for Gold for September 2013.
Magic the Gathering 2013 normally sells for $9.99 and will be available Sunday September 1, 2013 through September 15, 2013 for free to Xbox Live Gold members.
Tom Clancy’s Rainbow Six Vegas is normally a $20 download but will be free from Sept 16th through the end of the month.
Halo 3 has been confirmed as a future free download but no release date has been announced.