Prior to Adrián Beltré, my favorite Ranger was probably Rusty Greer, who received a non-roster invitation to spring training from the Twins in 2005. Greer, whose career had been derailed by numerous injuries, elected to retire instead.
Numerous players have worn uniforms of both the Twins and Rangers in their careers, including Twins broadcasters Bert Blyleven and Roy Smalley, plus bullpen coach Eddie Guardado. Chris Gimenez, now a Twin in large part due relationships he developed elsewhere with the Twins' new front office brain trust, played for Thad Levine in Texas. Heck, Dillon Gee has played for both teams this season.
Only a small handful of these shared alumni – less than ten percent – played for only those two teams. The most notable of these was a starter for a Twins team that won more than 90 games. He finished his seven year career with 1.8 rWAR. Who is he?