31 cards where the card types include “spy” or the text includes “spy”

Arcane Spyglass (Darksteel #93)
Balustrade Spy (Ravnica Remastered #66)
Brotherhood Spy (Assassin's Creed #282)
Clocknapper (Unstable #29)
Cogwork Spy (Conspiracy #59)
Defective Detective (Unstable #32)
Dewdrop Spy (Morningtide #30)
Dimir Spybug (Murders at Karlov Manor Commander #206)
Faerie Aerie (Unstable #181)
Graveyard Busybody (Unstable #34)
Hada Spy Patrol (Commander Anthology #40)
Merfolk Spy (Magic 2014 #62)
Mistway Spy (Murders at Karlov Manor #65)
Neurok Spy (Mirrodin #44)
Phoebe, Head of S.N.E.A.K. (Unstable #135)
Quicksmith Spy (Aether Revolt #41)
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)
Soulknife Spy (Adventures in the Forgotten Realms #75)
Spy Eye (Unstable #46)
Spyglass Siren (The Lost Caverns of Ixalan #78)
Spymaster's Vault (Modern Horizons 3 #230)
Stromgald Spy (Alliances #62)
Suspicious Nanny (Unstable #47)
Wu Spy (Portal Three Kingdoms #63)
X (Unstable #137)

Though this query has ended, its relics still slumber in New Argive.