Yeah he had success here in Toronto back in 2021 and I think if he's healthy he can be a solid mid-rotation arm who gives you around 150 innings with a WAR somewhere between 2 and 3. Even at $11M AAV, he's not bad if it costs nothing to acquire him since similar arms like even a Matt Boyd likely gets a bit more AAV with 2-3 years attached and other mid-rotation arms such as Eovaldi, Severino, Pivetta, etc likely will get around $18-20M AAV with 3 of 4 years attached.
If the Cards could send some money over with Matz like you said to get him down to $7 or $8M, would be ideal. Don't think you'll find an arm like Matz via free agency at that price unless you sign a Ross Stripling, Spencer Turnbull, Cal Quantrill, or Alex Wood etc.