GLENDALE, Ariz.—Rasul Douglas was living the life of an NFL journeyman just a few weeks ago, bouncing between camps and practice squads. Finally, the Green Bay Packers liked what they saw. Now he’s a Thursday night hero for the league’s hottest team—at one of his former team’s expense. Douglas corralled an interception with 12 seconds left in the fourth quarter that helped the Packers knock off the previously unbeaten Arizona Cardinals 24–21 in a thriller that featured two of the NFL’s top quarterbacks. “Blessed,” Douglas said. “You’re in a crazy mental state being in the league for five years, never been on the practice squad before. You feel like you are working for nothing kind of. Then you get a call and you are somewhere else and you’re playing.” The Cardinals looked like they were going to rally to win their eighth straight game but Kyler Murray threw the stunning …