How will the St. Louis Cardinals handle the Major League Baseball trade deadline? The Cardinals have been one of the most surprising, feel-good stories of 2025, with manager Oli Marmol presiding over a turnaround year. Fueled by young talent and a reinvigorated fan base, St. Louis is in the playoff picture, and things are looking up. According to Jon Heyman of the New York Post, “Star closer Ryan Helsley would be the Cardinals’ biggest trade piece.”