plate appearance, and without ever playing in another MLB game. The only players to have made their major league debuts in the postseason are Kiger and four others—Bug Holliday in the 1885 World Series, Adalberto Mondesí in the 2015 World Series, Alex Kirilloff in the 2020 American League Wild Card Series, and Shane McClanahan in the 2020 American League Division Series; the remaining four later played in regular season major league games. Some players have gone years between first being listed on an MLB active roster without playing (thus becoming phantoms), and eventually appearing in an MLB game (thus losing phantom status). Examples include: Pitcher Marcus Walden was promoted by the Toronto Blue Jays in April 2014 but did not appear in a game during his five-day stint. In 2018, he made the Opening Day roster of the Boston Red Sox and made his MLB debut on April 1. Pitcher Ryne Harper was promoted by the Seattle Mariners in May 2017 but did not appear in any games before being optioned back to the minor leagues. He made the 2019 Opening Day roster of the Minnesota Twins and made his MLB debut on March 31. Pitcher Daniel Camarena was promoted to the major leagues by the 2019 New York Yankees on July 6, 2019, but was optioned down the next day without appearing in a game. During the 2021 season, his contract was promoted by the San Diego Padres and he made his MLB debut on June 19. Pitcher Domingo Acevedo was called up to the major leagues on July 21, 2018, for the 2018 New York Yankees, but was sent down to the minor leagues hours later without appearing in a major league game. Acevedo was removed from the Yankees' 40-man roster after the 2018 season. On June 21, 2021, his contract was purchased by the Oakland Athletics and he made his MLB debut. Makers of baseball cards have issued major league rookie cards featuring some players who never actually played in MLB. Two known examples are listed below. Starting in 2005, the Major League Baseball Players Association (MLBPA) required card manufacturers to limit rookie cards to players already added to an MLB active roster, or players who appeared in an MLB game during the prior season. Note that card makers also issue cards of "future stars", "top prospects", or similar wording, which are not rookie cards and are