What CFL team has the second most grey cups?

The Edmonton Eskimos won it five years in a row (1978-1982), and also three years in a row (1954-1956). Other three-in-a-row winners were U of T (1909-1911), Queen's University (1922-24), and Toronto Argonauts (1945-47). Teams who won it two years running include Ottawa Senators (1925-26), Hamilton Tigers (1928-29), Toronto Argonauts (1937-38), Winnipeg Blue Bombers (1958-59 and 1961-62), Ottawa Rough Riders (1968-69), Toronto Argonauts (1996-97), and Montreal Alouettes (2009-10). Since the question specified CFL teams, you might want to exclude all results before the formation of the combined league in 1958. Of current CFL teams, Hamilton Tiger-Cats, Saskatchewan Roughriders, Calgary Stampeders and BC Lions have never won back-to-back championships.