Naga Oracle 
Creature — Snake Cleric
$0.09 #28243 0.12 9.5 years
When this creature enters, surveil 3. (Look at the top three cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
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Cards similar to Naga Oracle 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.
Contingency Plan96%
$0.17↑#12244↑0.0610.2 years
"Surveil 5."
Taigam's Scheming96%
$0.05↓#15098↑0.0612.1 years↑
"Surveil 5."
Curate95%
$0.15↑#4738↑0.055.5 years↓
"Surveil 2."
Otherworldly Gaze94%
$0.31↑#2493↑0.045.1 years↓
"Surveil 3."
Sultai Ascendancy93%
$0.33↑#9316↑0.00↓12.1 years↑
"At the beginning of your upkeep, surveil 2."
Think Tank93%
$0.23↑#20870↑0.1025.1 years↑
"At the beginning of your upkeep, surveil 1."
Whisper Agent92%
$0.09#242230.068.0 years↓
"When this creature enters, surveil 1."
Sanitation Automaton92%
$0.08↓#22572↑0.00↓2.7 years↓
"When this creature enters, surveil 1."
Imperious Inkmage92%
$0.06↓#251610.130.5 years↓
"When this creature enters, surveil 2."
Dimir Informant92%
$0.15↑#245340.00↓8.0 years↓
"When this creature enters, surveil 2."
Sterling Hound92%
$0.15↑#17644↑0.122.5 years↓
"When this creature enters, surveil 2."
A.I.M. Synthoids92%
$0.15↑#19059↑0.200.3 years↓
"When this creature enters, surveil 2."
Shore Lurker90%
$0.08↓#244280.070.7 years↓
"When this creature enters, surveil 1."
Watcher in the Mist90%
$0.05↓#282870.00↓8.0 years↓
"When this creature enters, surveil 2."
Wreckage Wickerfolk90%
$0.16↑#14137↑0.00↓1.7 years↓
"When this creature enters, surveil 2."
Barrier of Bones89%
$0.10↑#15296↑0.068.0 years↓
"When this creature enters, surveil 1."
Etherwrought Page88%
$0.22↑#245450.0617.5 years↑
"• Surveil 1."
Rummaging Wizard88%
$0.11↑#317020.00↓24.0 years↑
"
: Surveil 1."
: Surveil 1."
Semester Foreseer // Peer Review87%
$0.15↑#244920.01↓0.0 years↓
"When this creature enters, surveil 1."
Grim Flayer87%
$0.21↑#11440↑0.00↓10.2 years
"Whenever this creature deals combat damage to a player, surveil 3."