MGM is already building a nearly $1 billion casino in Springfield, Massachusetts, that threatens to take revenue and jobs away from the Foxwoods Resort Casino and Mohegan Sun in Connecticut. (AP) - MGM Resorts International revealed plans on Monday for a $675 million waterfront casino in Connecticut's largest city, the latest salvo in a competition with two Native American tribes that run two of the world's largest casinos in the southeastern part of the state.