Unwelcome Sprite 
Creature — Faerie Rogue
$0.22 #12804 0.04 0.7 years
Flying
Whenever you cast a spell during an opponent's turn, surveil 2. (Look at the top two cards of your library. You may 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 Unwelcome 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.
Dream Spoilers92%
$0.14↓#19623↓0.25↑3.1 years↑
"Flying"
Sinister Starfish85%
$0.10↓#9225↑0.005.3 years↑
"
: Surveil 1."
: Surveil 1."
Cruel Witness84%
$0.20↓#18800↓0.064.9 years↑
"Whenever you cast a noncreature spell, surveil 1."
Wretched Doll84%
$0.14↓#21347↓0.061.7 years
"
, : Surveil 1."
, : Surveil 1."
Vanguard Seraph84%
$0.17↓#104960.101.9 years↑
"Whenever you gain life for the first time each turn, surveil 1."
Nightveil Sprite83%
$0.14↓#6901↑0.008.0 years↑
"Whenever this creature attacks, surveil 1."
Il Mheg Pixie83%
$0.20↓#109830.21↑1.4 years
"Whenever this creature attacks, surveil 1."
Rune-Sealed Wall83%
$0.24↑#105790.001.9 years↑
": Surveil 1."
: Surveil 1."
MACH-1, Swooping Scoundrel82%
$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."
Appendage Amalgam82%
$0.17↓#140940.002.1 years↑
"Whenever this creature attacks, surveil 1."
Fear of Surveillance82%
$0.24↑#122150.002.1 years↑
"Whenever this creature attacks, surveil 1."
H.E.R.B.I.E., Lovable Robot82%
$1.01↑#103020.39↑0.3 years
"At the beginning of combat on your turn, if you've cast a noncreature spell this turn, surveil 1."
Case of the Shifting Visage81%
$0.36↑#8795↑0.132.7 years↑
"At the beginning of your upkeep, surveil 1."
Dragon's Rage Channeler80%
$1.10↑#1860↑0.23↑5.3 years↑
"Whenever you cast a noncreature spell, surveil 1."
Garland, Knight of Cornelia // Chaos, the Endless80%
$0.18↓#116890.41↑1.4 years
"Whenever you cast a noncreature spell, surveil 1."
Think Tank79%
$0.23↑#20870↓0.1025.1 years↑
"At the beginning of your upkeep, surveil 1."
Sultai Ascendancy79%
$0.33↑#9316↑0.0012.1 years↑
"At the beginning of your upkeep, surveil 2."
Boulderborn Dragon79%
$0.16↓#126530.25↑1.5 years
"Whenever this creature attacks, surveil 1."
Tocasia's Dig Site79%
$0.23↑#6335↑0.043.9 years↑
"
, : Surveil 1."
, : Surveil 1."
Suburban Sanctuary79%
$0.19↓#9091↑0.14↑1.1 years
"
, : Surveil 1."
, : Surveil 1."