10 cards where the set is “mkm” and the collector number >= 423 and the collector number <= 432

Long Goodbye (Murders at Karlov Manor #423)
Gleaming Geardrake (Murders at Karlov Manor #424)
Kraul Whipcracker (Murders at Karlov Manor #425)
Lightning Helix (Murders at Karlov Manor #426)
No More Lies (Murders at Karlov Manor #427)
Axebane Ferox (Murders at Karlov Manor #428)
Wojek Investigator (Murders at Karlov Manor #429)
Melek, Reforged Researcher (Murders at Karlov Manor #430)
Tomik, Wielder of Law (Murders at Karlov Manor #431)
Voja, Jaws of the Conclave (Murders at Karlov Manor #432)

The message was clear to Sorin—time to search for something else.