By Tzvi Machlin NBA icons Michael Jordan and Magic Johnson battled on the court many times throughout their careers. But the ultra-competitive Jordan has one more challenge for Magic. Behind the scenes at yesterday’s All-Star Game and 75th Anniversary Team celebration, Jordan spotted Magic and started ribbing him. The six-time NBA champion called Magic “an old dog” and challenged him to a “one-on-one right now.” The 62-year-old Magic was having way too much fun and started laughing. Fans who saw the video got to enjoy Magic’s squeaking laugh for the first time. We may never know if Magic accep…