33 cards where the cards have the “witherbloom” watermark

Beledros Witherbloom (Strixhaven: School of Mages #163)
Blex, Vexing Pest // Search for Blex (Strixhaven: School of Mages #148)
Blex, Vexing Pest // Search for Blex (Strixhaven: School of Mages #148)
Blight Mound (Commander 2021 #36)
Blood Researcher (Strixhaven: School of Mages #166)
Callous Bloodmage (Strixhaven: School of Mages #66)
Containment Breach (Strixhaven: School of Mages #125)
Cram Session (Strixhaven: School of Mages #170)
Culling Ritual (Strixhaven: School of Mages #172)
Daemogoth Titan (Strixhaven: School of Mages #174)
Daemogoth Woe-Eater (Strixhaven: School of Mages #175)
Deadly Brew (Strixhaven: School of Mages #176)
Dina, Soul Steeper (Strixhaven: School of Mages #178)
Gyome, Master Chef (Commander 2021 #5)
Harness Infinity (Strixhaven: School of Mages #191)
Hunt for Specimens (Strixhaven: School of Mages #73)
Infuse with Vitality (Strixhaven: School of Mages #194)
Moldering Karok (Strixhaven: School of Mages #206)
Mortality Spear (Strixhaven: School of Mages #207)
Necroblossom Snarl (Strixhaven: School of Mages #269)
Pestilent Cauldron // Restorative Burst (Strixhaven: School of Mages #154)
Pestilent Cauldron // Restorative Burst (Strixhaven: School of Mages #154)
Pest Infestation (Commander 2021 #65)
Pest Summoning (Strixhaven: School of Mages #211)
Professor of Zoomancy (Strixhaven: School of Mages #140)
Revival Experiment (Commander 2021 #74)
Rushed Rebirth (Strixhaven: School of Mages #228)
Sedgemoor Witch (Strixhaven: School of Mages #86)
Tend the Pests (Strixhaven: School of Mages #242)
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)
Willowdusk, Essence Seer (Commander 2021 #6)
Witherbloom Apprentice (Strixhaven: School of Mages #247)
Witherbloom Campus (Strixhaven: School of Mages #275)
Witherbloom Command (Strixhaven: School of Mages #248)
Witherbloom Pledgemage (Strixhaven: School of Mages #249)

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