46 cards where the illustration contains “cellarspawn”

Acrobatic Cheerleader (Duskmourn: House of Horror #1)
Ancient Cellarspawn (Duskmourn: House of Horror Commander #16)
Appendage Amalgam (Duskmourn: House of Horror #83)
Clammy Prowler (Duskmourn: House of Horror #45)
Clockwork Percussionist (Duskmourn: House of Horror #295)
Come Back Wrong (Duskmourn: House of Horror #292)
Cursed Recording (Duskmourn: House of Horror #296)
Dazzling Theater // Prop Room (Duskmourn: House of Horror #334)
Demolisher Spawn (Duskmourn: House of Horror Commander #31)
Entity Tracker (Duskmourn: House of Horror #290)
Final Vengeance (Duskmourn: House of Horror #99)
Glimmerburst (Duskmourn: House of Horror #62)
Grasping Longneck (Duskmourn: House of Horror #180)
Horror (Duskmourn: House of Horror Tokens #10)
Meathook Massacre II (Duskmourn: House of Horror #293)
My Will Is Irresistible (Duskmourn: House of Horror Commander #347)
Oblivious Bookworm (Duskmourn: House of Horror #300)
Only I Know What Awaits (Duskmourn: House of Horror Commander #350)
Overlord of the Balemurk (Duskmourn: House of Horror #113)
Overlord of the Balemurk (Duskmourn: House of Horror #391)
Overlord of the Boilerbilges (Duskmourn: House of Horror #146)
Overlord of the Boilerbilges (Duskmourn: House of Horror #393)
Overlord of the Floodpits (Duskmourn: House of Horror #68)
Overlord of the Floodpits (Duskmourn: House of Horror #389)
Overlord of the Hauntwoods (Duskmourn: House of Horror #194)
Overlord of the Hauntwoods (Duskmourn: House of Horror #395)
Overlord of the Mistmoors (Duskmourn: House of Horror #370)
Overlord of the Mistmoors (Duskmourn: House of Horror #387)
Reluctant Role Model (Duskmourn: House of Horror #289)
Silent Hallcreeper (Duskmourn: House of Horror #72)
Silent Hallcreeper (Duskmourn: House of Horror #345)
Stay Hidden, Stay Silent (Duskmourn: House of Horror #291)
The Master of Keys (Duskmourn: House of Horror Commander #4)
The Rollercrusher Ride (Duskmourn: House of Horror #155)
The Rollercrusher Ride (Duskmourn: House of Horror #298)
The Swarmweaver (Duskmourn: House of Horror #301)
They Came from the Pipes (Duskmourn: House of Horror Commander #14)
Threats Around Every Corner (Duskmourn: House of Horror #200)
Tyvar, the Pummeler (Duskmourn: House of Horror #202)
Valgavoth's Onslaught (Duskmourn: House of Horror #204)
Valgavoth's Onslaught (Duskmourn: House of Horror #324)
Wary Watchdog (Duskmourn: House of Horror #206)
Withering Torment (Duskmourn: House of Horror #313)
You Are Unworthy of Mercy (Duskmourn: House of Horror Commander #359)
You Cannot Hide from Me (Duskmourn: House of Horror Commander #360)
Your Mistake Is My Triumph (Duskmourn: House of Horror Commander #364)

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