Question: What is the name of the tournament that was formed by the Big 12 Conference that led to the Nebraska-Texas rivalry?

full_context: Document 1: 2006 Big 12 Championship Game: The 2006 Dr. Pepper Big 12 Championship Game was held on December 2, 2006 at Arrowhead Stadium in Kansas City, Missouri, and pit the divisional winners from the Big 12 Conference: the Nebraska Cornhuskers, winner of the North division against the Oklahoma Sooners, winner of the South division. The Sooners defeated the Cornhuskers, 21-7. This was the first time the two teams had ever met in the Big 12 conference championship game.
Document 2: 2011 Nebraska Cornhuskers football team: The 2011 Nebraska Cornhuskers football team represented the University of Nebraska–Lincoln in the 2011 NCAA Division I FBS football season. The Cornhuskers were coached by Bo Pelini and played their home games at Memorial Stadium in Lincoln, Nebraska. This season was Nebraska's first in the Big Ten Conference in the Legends Division as they moved from the Big 12 Conference to the Big Ten following the conclusion of the 2010 season. They finished the season 9–4, 5–3 in Big Ten play to finish in third place in the Legends Division. They were invited to the Capital One Bowl where they were defeated by South Carolina 13–30.
Document 3: Nebraska–Texas football rivalry: The Nebraska–Texas football rivalry was an American college football rivalry between the Nebraska Cornhuskers and Texas Longhorns. The rivalry dissolved when Nebraska left the Big 12 Conference for the Big Ten Conference. Due to Colorado, Missouri, Nebraska, and Texas A&M leaving the conference, the Big 12 Championship Game dissolved due to a lack of teams in the conference. The last ever Big 12 Championship game was played between Nebraska and Oklahoma in 2010.
Document 4: 2003 Big 12 Championship Game: The 2003 Big 12 Football Championship Game was played on December 6, 2003 in Arrowhead Stadium in Kansas City, Missouri. The game determined the 2003 football champion of the Big 12 Conference. The Oklahoma Sooners, winners of the South division of the Big 12, were upset by the Kansas State Wildcats, who won the North division, by a score of 35–7. This was the second time the two teams met in the Big 12 Championship Game. The first was the 2000 Big 12 Championship Game, a game in which Oklahoma won 27-24.
Document 5: 1996 Big 12 Championship Game: The 1996 Dr Pepper Big 12 Championship Game was held on December 7, 1996, at The Dome at America's Center, then known as Trans World Dome, in St. Louis, Missouri. The divisional winners from the Big 12 Conference squared off in the 1st edition of the game. The Texas Longhorns represented the South Division and the Nebraska Cornhuskers represented the North Division. Texas won the contest 37–27, keyed by a daring 4th down conversion from their own 28-yard line with slightly more than 2 minutes left in the 4th quarter when the score was 30–27 in their favor.
Document 6: 2000 Big 12 Championship Game: The 2000 Big 12 Football Championship Game was played on December 2, 2000 in Arrowhead Stadium in Kansas City, Missouri. The game determined the 2000 football champion of the Big 12 Conference. The Oklahoma Sooners, winners of the South division of the Big 12, narrowly beat the Kansas State Wildcats, who won the North division, by a score of 27-24. This was the first time the two teams met in the Big 12 Championship Game, as they would meet again in the 2003 edition.
Document 7: Big 12 Conference Baseball Tournament: The Big 12 Conference Baseball Tournament (sometimes known simply as the Big 12 Tournament) is the conference championship tournament in baseball for the Big 12 Conference. Going back to the original format abandoned in 2005, the tournament consists of two separate four-team double-elimination tournaments. The winners of each of those tournament face each other in a one-game match for the championship. The winner receives the conference's automatic bid to the NCAA Division I Baseball Tournament.
Document 8: Big 12 Conference football: The Big 12 Conference is a conference of 10 (originally 12) universities which participate in the National Collegiate Athletic Association's Division I Football Bowl Subdivision football. The conference was formed in 1994 but did not begin conference play until the fall of 1996. The schools that compose the Big 12 Conference, except West Virginia, were members of either the Big Eight Conference or the Southwest Conference, and have won 21 national titles including 3 titles since the inception of the Big 12 Conference.
Document 9: 2009 Big 12 Championship Game: The 2009 Dr Pepper Big 12 Championship Game was held on December 5, 2009 at Cowboys Stadium in Arlington, Texas. The divisional winners from the Big 12 Conference squared off in the 14th edition of the game. The Texas Longhorns represented the South Division and the Nebraska Cornhuskers represented the North. Texas won 13–12 on a last second field goal by placekicker Hunter Lawrence.
Document 10: Nebraska Cornhuskers: The Nebraska Cornhuskers (often abbreviated to Huskers) is the name given to the intercollegiate athletic teams of the University of Nebraska–Lincoln. The university is a member of the Big Ten Conference and the Cornhuskers compete in NCAA Division I, fielding 22 varsity teams in 15 sports.
Document 11: 2009 Nebraska Cornhuskers football team: The 2009 Nebraska Cornhuskers football team represented the University of Nebraska–Lincoln in the 2009 NCAA Division I FBS football season. The Cornhuskers played their home games at Memorial Stadium in Lincoln, Nebraska and were led by head coach Bo Pelini. The Cornhuskers finished the season 10–4, 6–3 in Big 12 and were Big 12 North Division champions and represented the division in the Big 12 Championship Game, where they lost to Texas 13–12. Nebraska was invited to the Holiday Bowl, where they defeated Arizona 33–0.
Document 12: Big 12 Championship Game: The Big 12 Championship Game is a college football game held by the Big 12 Conference. The game was played each year since the conference's formation in 1996 until 2010 and will return starting with the 2017 season. From 1996 to 2010 the championship game pitted the Big 12 North Division champion against the South Division champion in a game held after the regular season was completed. From 2017 onward, the game will feature the two teams with the best records within the conference.
Document 13: Nebraska–Oklahoma football rivalry: The Nebraska–Oklahoma football rivalry was an American college football rivalry between the Nebraska Cornhuskers football team of the University of Nebraska and Oklahoma Sooners football team of the University of Oklahoma. The rivalry continued in the Big 12 Conference until 2010, though the rivalry was more prominent when both teams were members of the former Big Eight Conference before 1996. The annual rivalry effectively ended when Oklahoma was lined up in the Southern division of the newly formed Big 12 to maintain its rivalry with Texas and also its recruiting hotbeds in Texas. As both teams won their respective divisions in 2010, they met in the 2010 Big 12 Championship Game. Following the 2010 season, Nebraska left the Big 12 for the Big Ten Conference. As a result, the 2009 meeting turned out to be the last regular-season scheduled meeting. Nebraska's departure left the future of the rivalry in doubt. The two teams have agreed to play a home-and-home non-conference series scheduled for 2021 in Norman (to celebrate the 50th anniversary of the 1971 classic) and 2022 in Lincoln. They added games in 2029 and 2030 as well.
Document 14: 2010 Big 12 Championship Game: The 2010 Big 12 Championship Game was played at 7:00 p.m. on Saturday, December 4, 2010, at AT&T Stadium, then known as Cowboys Stadium, in Arlington, Texas to determine the 2010 football champion of the Big 12 Conference. At that time, it was the final championship game for the conference as two members of the Big 12 had announced their intentions to leave the conference. The South Division was represented by Oklahoma and the North Division was represented by Nebraska. Oklahoma defeated Nebraska 23-20 to win the final Big 12 Championship and claim their seventh Big 12 Title. It was Oklahoma's eighth appearance in the game.
Document 15: 2010 Nebraska Cornhuskers football team: The 2010 Nebraska Cornhuskers football team represented the University of Nebraska in the 2010 NCAA Division I FBS football season. The team was coached by Bo Pelini and played their home games at Memorial Stadium in Lincoln, Nebraska. They were members of the North Division of the Big 12 Conference. It was Nebraska's 102nd and last season in the Big 12 (including years in the MVIAA/Big Eight) as they will begin competing in the Big Ten Conference in 2011.
ground_truth: Big 12 Championship Game