#3- Jimmy Key- 29.9 WAR
Key would remain with the organization for nine seasons making 317 appearances including 250 starts on the Blue Jays bump. In 1987, Key finished second in AL Cy Young voting, losing out on the honour to Roger Clemens.
Key went 17-8 with an impressive 2.76 earned run average, good enough for a career-high 7.4 WAR in 261 innings of work. The five-time All-Star finished second twice and fourth once in the Cy Young race during his MLB career.
The soft-tossing lefty ended his Blue Jays tenure with a 116-81 record with a 3.42 earned run average and a 29.9 WAR. Key is the most decorated lefty in Blue Jays history and sports the highest WAR total among southpaws. Key hit the open market following the 1992 championship season and joined the Yankees as a free agent.
Key concluded his 15-year career with a lofty 49.2 WAR tally and ranks fourth in Blue Jays victories.