The St. Louis Cardinals are expected to be very active at the trade deadline, whether it be as buyers or sellers. As the Cardinals continue to fall off from their hot start this season, it seems as though they may lean toward selling. There are a few expiring players, like Ryan Helsley, Erick Fedde, and a few others who make sense as trade chips, but there have also been rumblings that the Cardinals could use breakout star Brendan Donovan in a trade. Drew Koch of FanSided recently suggested the Houston Astros could look to swing a trade for Donovan this season.