18 cards where the set is “stx” and the card types include “warlock”

Arrogant Poet (Strixhaven: School of Mages #63)
A-Tenured Inkcaster (Strixhaven: School of Mages #A-88)
Callous Bloodmage (Strixhaven: School of Mages #66)
Extus, Oriq Overlord // Awaken the Blood Avatar (Strixhaven: School of Mages #149)
Extus, Oriq Overlord // Awaken the Blood Avatar (Strixhaven: School of Mages #149)
Killian, Ink Duelist (Strixhaven: School of Mages #197)
Leech Fanatic (Strixhaven: School of Mages #75)
Novice Dissector (Strixhaven: School of Mages #79)
Oriq Loremage (Strixhaven: School of Mages #80)
Owlin Shieldmage (Strixhaven: School of Mages #210)
Promising Duskmage (Strixhaven: School of Mages #85)
Sedgemoor Witch (Strixhaven: School of Mages #86)
Shadewing Laureate (Strixhaven: School of Mages #229)
Shaile, Dean of Radiance // Embrose, Dean of Shadow (Strixhaven: School of Mages #158)
Shaile, Dean of Radiance // Embrose, Dean of Shadow (Strixhaven: School of Mages #158)
Silverquill Apprentice (Strixhaven: School of Mages #231)
Spiteful Squad (Strixhaven: School of Mages #237)
Tenured Inkcaster (Strixhaven: School of Mages #88)
Valentin, Dean of the Vein // Lisette, Dean of the Root (Strixhaven: School of Mages #161)
Valentin, Dean of the Vein // Lisette, Dean of the Root (Strixhaven: School of Mages #161)
Witherbloom Pledgemage (Strixhaven: School of Mages #249)

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