The W.N.B.A.âs 13th team, the first new franchise to join the league since 2008, will be called the Valkyries and will play at Chase Center in San Francisco starting next year.The W.N.B.A.âs 13th team, the first new franchise to join the league since 2008, will be called the Valkyries and will play at Chase Center in San Francisco starting next year.