Likely, the team will have to look outside of the organization to find this. Currently, the St. Louis Cardinals have Brett Cecil, Chasen Shreve and Tyler Webb to call upon when needed. Two of the three are not trustworthy, and the other is Shreve. And some might even consider that a stretch.
So, if the Cardinals do not seek outside help, who in the organization can serve as a southpaw out of the bullpen? There are not a ton of options, as you might guess. Although, there are enough to where we should never have to see Tyler Webb again.