Need a catcher?

Signing Barney Maxon has made Bobby Krieger somewhat redundant. He's an excellent backup catcher (.871 OPS/13.1 VORP in 167 AB last year and rated 82 at catcher) who could probably start, but he's behind both Maxon and George Robinson.

Instead of trying to stash Krieger at AAA, I'm looking to move him in a trade. I'm looking for a good bullpen prospect in return, preferably left-handed. I'd be willing to package a draft pick with Krieger for an elite arm, too.