Angela Heikes took the baton this fall from the legendary Ed Stevenson, who helped build the Mystic Lake gaming empire into a nationally influential colossus. She inherits an operation that has been so far immune from the diminishing returns afflicting tribal gaming nationwide. Whether she can build on her predecessor’s legacy is an open question, as tribal gaming prepares to pivot to a millennial generation that has shown little affinity for its bread and butter, the solitary passions of their parents: slot machines and video poker.