I just finished 5 ebooks that are the free type with kindle unlimited that's the Montague and Strong series. Worth a try if you have kindle unlimited. It has good and bad things about it, but I liked it. The character references that wizard in Chicago (meaning Harry Dresden) but he also references a wizardly type in Saint Louis in the same sentence. Anyone know who that is?

Anyway, the main character is cursed to immortality by Shiva, has a time stopping sigil on his wrist that causes a dominatrix librarian dressed lady luck to appear and slap him around a bit, a pet hellhound, and is best friend's with a mage who he operates a detective agency with.

Saint Louis is probably Shayne Silvers Nate Temple series and spinoff https://www.goodreads.com/series/250502-templeverse-chronological-order which by the way is a fun to read series.