Nightveil Sprite 
Creature — Faerie Rogue
$0.14 #6901 0.00 8.0 years
Flying
Whenever this creature attacks, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
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Cards similar to Nightveil Sprite 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.
Il Mheg Pixie100%
$0.20↑#10983↓0.21↑1.4 years↓
"Whenever this creature attacks, surveil 1."
Appendage Amalgam100%
$0.17↑#14094↓0.002.1 years↓
"Whenever this creature attacks, surveil 1."
Fear of Surveillance100%
$0.24↑#12215↓0.002.1 years↓
"Whenever this creature attacks, surveil 1."
Boulderborn Dragon98%
$0.16↑#12653↓0.25↑1.5 years↓
"Whenever this creature attacks, surveil 1."
Ultimecia, Time Sorceress // Ultimecia, Omnipotent90%
$0.21↑#11042↓0.56↑1.4 years↓
"Whenever this card enters or attacks, surveil 2."
Sinister Starfish90%
$0.10↓#9225↓0.005.3 years↓
"
: Surveil 1."
: Surveil 1."
Wretched Doll89%
$0.14#21347↓0.061.7 years↓
"
, : Surveil 1."
, : Surveil 1."
Rune-Sealed Wall88%
$0.24↑#10579↓0.001.9 years↓
": Surveil 1."
: Surveil 1."
Vanguard Seraph88%
$0.17↑#10496↓0.10↑1.9 years↓
"Whenever you gain life for the first time each turn, surveil 1."
Namazu Trader86%
$0.07↓#19617↓0.001.4 years↓
"Whenever this creature attacks, you may sacrifice another creature or artifact. If you do, surveil 2."
Tocasia's Dig Site86%
$0.23↑#63350.043.9 years↓
"
, : Surveil 1."
, : Surveil 1."
Suburban Sanctuary86%
$0.19↑#9091↓0.14↑1.1 years↓
"
, : Surveil 1."
, : Surveil 1."
Ominous Asylum86%
$0.20↑#78290.071.1 years↓
", : Surveil 1."
, : Surveil 1."
Savage Mansion86%
$0.17↑#9438↓0.18↑1.1 years↓
", : Surveil 1."
, : Surveil 1."
Sinister Hideout86%
$0.17↑#74430.10↑1.1 years↓
", : Surveil 1."
, : Surveil 1."
University Campus86%
$0.19↑#8990↓0.031.1 years↓
", : Surveil 1."
, : Surveil 1."
MACH-1, Swooping Scoundrel86%
$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."
Titan's Grave86%
$0.20↑#69490.010.5 years↓
"
, : Surveil 1."
, : Surveil 1."
Think Tank86%
$0.23↑#20870↓0.10↑25.1 years↑
"At the beginning of your upkeep, surveil 1."
Spectacle Summit86%
$0.14#78940.040.5 years↓
"
, : Surveil 1."
, : Surveil 1."