Iowa State has won thirteen NCAA National Team Championships in three sports. By far Iowa State's most successful sport is Wrestling, which in spite having not won a national title for over twenty years, has continued to remain a contender for the national title. In Wrestling, Iowa State has finished as runners up for the National title numerous times, their last being in 2007. Iowa State uses a cardinal, Cy, as its mascot instead of an actual tornado or Cyclone. Originally silver, yellow, and black, the school colors were changed to cardinal and gold in 1899 to make dyeing sweaters easier. A council was formed in October 1899. Iowa State's most heated rival is the University of Iowa Hawkeyes. Though the two teams first played each other in 1894 (in football), the Cy-Hawk Trophy was not introduced until 1977 when the two teams met for the first time since 1934. The trophy is awarded to the victor of the annual football game.