Few things define a general manager's tenure with a team like his success on the trade market. It is one of the easiest ways for fans to look back and assess whether a GM was able to make their favorite team better or worse. When a trade hits it can offer incredible value, but when you trade away a future MVP candidate the disappointment can linger for seasons.
The question I want to pose today is a basic one. If you could "undo" one Reds trade since 2000 (post-Griffey trade) which would you pick? A number of factors can come in to play when assessing the success of a trade.