35 cards where the cards have the “agentsofsneak” watermark

Accessories to Murder (Unstable #167)
Clocknapper (Unstable #29)
Deadly Poison Sampler (Unstable #174)
Defective Detective (Unstable #32)
Dictation Quillograph (Unstable #175)
Dispatch Dispensary (Unstable #176)
Faerie Aerie (Unstable #181)
Faerie Spy (Unstable Tokens #4)
Finders, Keepers (Unstable #55)
Five-Finger Discount (Unstable #33)
Graveyard Busybody (Unstable #34)
Hypnotic Swirly Disc (Unstable #189)
Insufferable Syphon (Unstable #191)
Magic Word (Unsanctioned #24)
Masterful Ninja (Unstable #60)
Overt Operative (Unstable #64)
Phoebe, Head of S.N.E.A.K. (Unstable #135)
Rogue (Unstable Tokens #7)
Secret Base (Unstable #165b)
Sly Spy (Unstable #67f)
Sly Spy (Unstable #67c)
Sly Spy (Unstable #67a)
Sly Spy (Unstable #67e)
Sly Spy (Unstable #67b)
Sly Spy (Unstable #67d)
S.N.E.A.K. Dispatcher (Unstable #43)
Spell Suck (Unstable #45)
Split Screen (Unstable #158)
Spy Eye (Unstable #46)
Subcontract (Unstable #73)
Suspicious Nanny (Unstable #47)
Time Out (Unsanctioned #28)
Top-Secret Tunnel (Unstable #207)
Twiddlestick Charger (Unstable #210)
X (Unstable #137)

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