It's not often that you see the St. Louis Cardinals make trades with their rivals, and it's even rarer for the deal to involve a player that was a major foe of theirs just a few years prior.
On August 30th, 2013, the Cardinals swung a deal for right-handed reliever John Axford from the Milwaukee Brewers in what seemed like a pretty minor depth move for their bullpen, but Axford actually played a pretty big role in helping the club reach the World Series that year.