One of the many Cardinals infielders
This one is much more open-ended, as there are a bunch of different shortstop-capable players that the Cardinals could end up moving. Each of Paul DeJong, Tommy Edman and Brendan Donovan are apparently available in trade talks and each of them could appeal to the Blue Jays.
DeJong, 29, has magically remembered what it is to be a passable Major League Baseball player after struggling mightily in the past few years. A former 30-home run hitter, DeJong was optioned down to the minor leagues last year because of how much of an offensive slide he was in. This year, he has 13 home runs and a 93 OPS+ through 81 games.
Edman, 28, is a lightning-quick, slap-hitting utilityman who can bounce around all over the diamond. He is a switch-hitter that gets on base a ton, steals bases and plays solid defense at essentially all infield and outfield positions. His value would be much higher than DeJong's for obvious reasons, but he is not set to become a free agent until the conclusion of the 2025 campaign and would provide much more to the Jays than DeJong would. In 84 games this year, Edman has seven home runs with 14 steals and an 89 OPS+. It's worth noting that he is currently on the 10-day injured list with a minor injury, so even if the Jays did land him, he wouldn't be able to slot into the lineup right on day one.
Donovan, 26, won a Gold Glove last year and finished third in the NL Rookie of the Year voting. While he is not a switch-hitter like Edman, he can also bounce around all over the field and comes with a bit more pop in his bat. Appearing at six positions and hitting 11 home runs so far this season, Donovan is likely going to be the most expensive Cardinals infielder on this list primarily because he won't be a free agent until the end of the 2027 season.