The brightest spot in Garza's career came in 1993 when he replaced an injured Matt Dunigan in Week 17 of the season. He led the Winnipeg Blue Bombers to a 20-19 victory over the Hamilton Tiger-Cats in the Eastern Final. Garza's success was short lived, as the team lost the Grey Cup 33-23 to the Edmonton Eskimos. Garza tore his ACL early in the 1994 season in Winnipeg, and spent the next 8 months recovering from that injury. He spent the next season splitting the quarterback duties of the Ottawa Rough Riders with Danny Barrett and was David Archer's backup in 1996. He retired after the team folded and he was not picked up in the dispersal draft.