Isla Fisher, currently in Australia filming Baz Luhrmann’s “The Great Gatsby,” is in negotiations to join the cast of Summit Entertainment’s magician heist pic “Now You See Me.”Mark Ruffalo is set to star as the leader of a team of FBI agents who are investigating the Four Horsemen, a squad of the world’s greatest illusionists who pull off a series of daring bank heists during their performances, then shower the profits on their auds. Jesse Eisenberg will play the arrogant yet brilliant leader of the Four Horsemen, while Morgan Freeman and Melanie Laurent co-star as an ex-magician and a federal agent, respectively. Fisher is in talks to play Henley, a master technician who builds contraptions to aid in the illusion of the heists. Amanda Seyfried had been in negotiations for the role but her deal never closed. Louis Leterrier is directing from a script by Edward Ricourt (“Year 12″) and Boaz Yakin. Alex Kurtzman and Roberto Orci are producing via their shingle Kurtzman Orci Paper Products, whose Bobby Cohen will exec produce along with Yakin. Fisher recently voiced a role in “Rango” and is set to return to the sound booth to voice the Tooth Fairy in DreamWorks Animation’s “Rise of the Guardians.” She’s playing Myrtle Wilson, a married woman who has an affair with Tom Buchanan (Joel Edgerton) in “Great Gatsby.” She’s repped by CAA and Mosaic, as well as Shanahan Management in Australia.