Herschel Walker Trade (1989)

The 1989 Herschel Walker trade gave the Vikings a star running back but cost them 11 players and draft picks, while Dallas flipped those picks into three Super Bowl championships. Minnesota received 1,200 rushing yards from Walker over three seasons — far from elite — and missed the playoffs repeatedly. This deal outperforms #1 in immediate roster turnover, as the Vikings surrendered a king's ransom that built a dynasty. At a $15 million equivalent in modern value, it’s 30% richer in assets than the typical blockbuster, cementing its place among the worst.