Today, I'm going to cover the mound warriors who wore the bleu, blanc, et rouge of Les Expos, and the blue and white of the Blue Jays.
Every transaction involving Balor was a direct purchase from his previous team. The interesting thing is he made his Major League debut at the age of 19, and was out of baseball before the age of 30. According to his Wikipedia page, he had injury issues starting in 1974. He also apparently threw a perfect game in a Winter League in Puerto Rico.
Randy St. Claire was a reliever who pitched from 1984-1994 for the Expos, Reds, Twins, Braves and Blue Jays. He played for the Expos from 1984-1988 and for the Jays in 1994. Again, a largely unremarkable career, but has made an impact as a coach, where he is currently the pitching coach for the Buffalo Bisons.
Willie Fraser spent most of his career with the California Angels, but did spend 13 games with the Jays in 1991. He actually came to the Jays as part of a package that brought Devon White to the Jays as well.
Traded by the California Angels with Marcus Moore and Devon White to the Toronto Blue Jays for a player to be named later, Junior Felix and Luis Sojo. The Toronto Blue Jays sent Ken Rivers (minors) (December 4, 1990) to the California Angels to complete the trade.
Fraser was selected off waivers by the Cardinals on June 26, 1991. In 1995, he signed with the Expos for his final Major League appearances.
John Candelaria was a pitcher from 1975-1993. He was a starter for the most part, but spent his time in Montreal and Toronto as a reliever. An interesting fact is he pitched for both New York teams, both Los Angeles teams, and both Canadian teams over the course of his career.
Now we come to a Canadian who has played for both. Denis Boucher pitched from 1991-1994 for Toronto, Cleveland, and Montreal. Boucher was a part of the trade that sent Glenallen Hill and Mark Whiten to the Indians for Tom Candiotti and Turner Ward. He was chosen by the Rockies in the Expansion draft in 1993, then was traded to the Padres. The Padres then traded him to the Expos.
When he became an Expo, fans turned out to see the hometown boy pitch. In 1995, he was part of history when he teamed with Joe Siddall for an all-Canadian battery, the first time it happened in Major League Baseball History.
Luis Aquino pitched for the Jays and Expos as well. He was signed as an amateur free agent in 1981. He didn't do much for the Jays, only appearing in 7 games and pitching 11 1/3 innings. He spent 1987 in the minors, split between Syracuse and Omaha, as the Jays sent him to the Royals for Juan Beniquez. From 1989-1992 he spent most of the time in the bullpen for Kansas City, filling in as a spot starter as needed. After going to Florida to wear the teal, (I miss those uniforms) he signed with the Expos in 1995. He only pitched in 29 games, for 37 1/3 innings before being traded to the San Francisco Giants.
In 97 games for Montreal, he was 5-7 with a 5.51 ERA. For the Jays, he was 1-1 4 ERA in 9 games, 6 of them starts.
Though not Canadian team related, he was part of the trade that brought the Diamondbacks Curt Schilling from Philadelphia.
Ahhh Bill Risley. How I try to forget your existence.
He was drafted by the Cincinnati Reds but was traded to the Expos along with John Wetteland for Willie Greene, Dave Martinez and Scott Ruskin. His debut in 1992 was his only appearance, a start in the second game of a double-header against the Dodgers. The rest of his career was spent in the bullpen. The Expos waived him and he was taken by the Mariners. In 1995 he was traded by the Mariners to the Jays with Miguel Cairo for Edwin Hurtado and Paul Menhart. For the next three seasons, 1996-1998, he was largely forgettable on largely forgettable Blue Jays teams. I remember more than once turning off the game when he came to the mound, just because I couldn't bear to see the result.
He now works with the Australian Baseball League.
As a Jay he was solid, if unspectacular. In 2006 he left as a free agent to go back to Los Angeles.
Others who have pitched for both teams that I don't have cards of (yet) are Miguel Batista, Darwin Cubillian, Scott Downs, Shawn Hill, Tomo Ohka, Jon Rauch, and Scott Service.