Unexplained Disappearance 
Instant
$0.21 #17574 0.00 7.9 years
Return target creature to its owner's hand.
Surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)
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Cards similar to Unexplained Disappearance expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Deadly Visit96%
$0.07↓#23885↓0.007.9 years
"Surveil 2."
+1 more matching line
Drown in Shapelessness95%
$0.17↓#26684↓0.008.2 years
"Return target creature to its owner's hand."
Unsummon95%
$0.08↓#2956↑0.32↑33.1 years↑
"Return target creature to its owner's hand."
Uncharted Voyage93%
$0.09↓#177810.031.8 years↓
"Surveil 1."
+1 more matching line
Sanitation Automaton92%
$0.08↓#22325↓0.18↑2.6 years↓
"When this creature enters, surveil 1."
Whisper Agent92%
$0.07↓#23860↓0.43↑7.9 years
"When this creature enters, surveil 1."
Consider92%
$0.29↑#379↑0.11↑4.9 years↓
"Surveil 1."
Shore Lurker92%
$0.09↓#24720↓0.000.6 years↓
"When this creature enters, surveil 1."
A.I.M. Synthoids92%
$0.11↓#203190.000.2 years↓
"When this creature enters, surveil 2."
Sterling Hound92%
$0.17↓#172780.072.4 years↓
"When this creature enters, surveil 2."
Imperious Inkmage92%
$0.05↓#25419↓0.000.4 years↓
"When this creature enters, surveil 2."
Dimir Informant92%
$0.15↓#24240↓0.007.9 years
"When this creature enters, surveil 2."
Sinister Starfish92%
$0.18↓#9367↑0.005.2 years↓
"
: Surveil 1."
: Surveil 1."
Sinister Sabotage91%
$0.20↓#6377↑0.36↑7.9 years
"Surveil 1."
Watcher in the Mist91%
$0.05↓#28012↓0.007.9 years
"When this creature enters, surveil 2."
Wreckage Wickerfolk91%
$0.21#141600.15↑1.6 years↓
"When this creature enters, surveil 2."
Wretched Doll91%
$0.15↓#21195↓0.18↑1.6 years↓
"
, : Surveil 1."
, : Surveil 1."
Muse's Encouragement90%
$0.06↓#23314↓0.000.4 years↓
"Surveil 2."
Barrier of Bones90%
$0.08↓#151500.007.9 years
"When this creature enters, surveil 1."
Mephitic Vapors90%
$0.11↓#205910.36↑7.9 years
"Surveil 2."