How about, like, yesterday?
The Cardinals are one of the top two teams by Vegas odds in the Juan Soto sweepstakes, there are reports they actually made an offer for him, and Soto just turned down a contract worth half a billion. The Cardinals have had a lot of top guys linked in trades, Goldschmidt and Arenado were acquired by trade and are both Hall of Fame candidates after all, but Soto at this point is probably a bigger name than any of them, Tkachuk included.
It certainly is fun, though!
One of the hallmarks of both the Blues and Cardinals are being in contention and in the playoffs in nearly every year, so they lack the high draft picks typically needed to acquire franchise-level talent that's built championship winning juggernauts like the Hawks, Lightning, Avs, and Astros, so it's certainly exciting.
It's rare to be able to acquire a player like Tkachuk or Soto at age 24/23 respectively even if you have to sign them to a huge contract. Those type of players are usually only available at those ages if you drafted them yourself (or in baseball's case signed them as an international FA).
It'd be nicer if Tkachuk was a defenseman of this caliber since that'd fit our team needs more, but I still think it's an opportunity for the Blues.