Hoping to work some magic with a long-term Las Vegas show and TV specials, Brillstein-Grey has signed to manage illusionist David Blaine.The Vegas venue would be the latest step for the magician, who has toplined four TV specials on ABC. The first featured Blaine performing tricks for passersby on the sidewalk, but his subsequent specials have been exercises in endurance. In 2000, he encased himself in a solid block of ice for 62 hours in Times Square and was released during a special viewed by over 15 million people. He followed last year with “Vertigo,” in which he stood on a 22-inch platform in Manhattan’s Bryant Park for 35 hours without food or, more importantly, a safety net. Two days later, he leapt onto a pile of cardboard boxes.