The expanded wild card format has its critics and its flaws, but since its introduction in 2012, it's yielded no shortage of down-to-the-wire suspense, with the full playoff picture not coming into focus until the season's final day—or in the case of 2013, until a Game 163 tiebreaker could be played. Even before that, the single wild card granted plenty of thrills and chills, including tiebreaker games in three straight years (2007–09) and the total mayhem of the end of the '11 season, when the Rays and Cardinals snatched spots away from the Red Sox and Braves, respectively, on the season's final day.
Team Entropy rides again: MLB's massive tie scenarios for 2016
