Marauding Sphinx 
Creature — Sphinx Rogue
$0.17 #18210 0.43 2.5 years
Flying, vigilance, ward 
Whenever you commit a crime, surveil 2. This ability triggers only once each turn. (Targeting opponents, anything they control, and/or cards in their graveyards is a crime.)
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Cards similar to Marauding Sphinx 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.
Watcher of Hours85%
$0.30↑#10084↑0.14↓2.7 years
"Whenever you remove a time counter from this card while it's exiled, surveil 1."
+1 more matching line
Hraesvelgr of the First Brood83%
$0.27↑#7708↑0.15↓1.4 years↓
"Flying, vigilance, ward "
"
Vanguard Seraph82%
$0.17#10496↑0.10↓1.9 years
"Whenever you gain life for the first time each turn, surveil 1."
Sinister Starfish82%
$0.10↓#9225↑0.00↓5.3 years↑
"
: Surveil 1."
: Surveil 1."
Sleep-Cursed Faerie81%
$0.37↑#149310.00↓3.1 years
"Flying, ward "
"
MACH-1, Swooping Scoundrel81%
$0.26↑#25846↓0.27↓0.3 years↓
"When this card enters and whenever you gain life, surveil 1. This ability triggers only once each turn."
Nightveil Sprite81%
$0.14↓#6901↑0.00↓8.0 years↑
"Whenever this creature attacks, surveil 1."
Il Mheg Pixie81%
$0.20↑#10983↑0.21↓1.4 years↓
"Whenever this creature attacks, surveil 1."
Canopy Gargantuan80%
$4.52↑#3071↑0.401.5 years
"Flying, ward "
"
Appendage Amalgam80%
$0.17#14094↑0.00↓2.1 years
"Whenever this creature attacks, surveil 1."
Fear of Surveillance80%
$0.24↑#12215↑0.00↓2.1 years
"Whenever this creature attacks, surveil 1."
Wretched Doll80%
$0.14↓#213470.06↓1.7 years
"
, : Surveil 1."
, : Surveil 1."
Twining Twins // Swift Spiral80%
$0.17#12434↑0.22↓3.1 years
"Flying, vigilance, ward 
"
"
Lord of Change80%
$2.83↑#6141↑0.354.0 years↑
"Flying, ward "
"
Rune-Sealed Wall80%
$0.24↑#10579↑0.00↓1.9 years
": Surveil 1."
: Surveil 1."
Benevolent River Spirit80%
$0.17#193090.11↓0.9 years↓
"Flying, ward "
"
Sultai Ascendancy78%
$0.33↑#9316↑0.00↓12.1 years↑
"At the beginning of your upkeep, surveil 2."
Think Tank78%
$0.23↑#208700.10↓25.1 years↑
"At the beginning of your upkeep, surveil 1."
Boulderborn Dragon78%
$0.16↓#12653↑0.25↓1.5 years
"Flying, vigilance"
+1 more matching line
Essence Anchor78%
$0.25↑#8624↑0.24↓1.5 years
"At the beginning of your upkeep, surveil 1."