Emily Longeretta Mira Sorvino wasn’t about to start conjuring up any spirits on the set of “Shining Vale.” When she learned she’d be playing three characters — Rosemary Wellington, Ruth Levin and Nellie Burke — in the second season of the Starz comedy, the actor immediately asked showrunner Jeff Astrof for details so she could start prepping. “It was very ambitious,” Astroff told Variety on the Los Angeles set of the second season about his big ideas for the new episodes.