Boulderborn Dragon 
Artifact Creature — Dragon
$0.16 #12849 0.05 1.4 years
Flying, vigilance
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 Boulderborn Dragon 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.
Nightveil Sprite97%
$0.11↓#7481↑0.057.9 years↑
"Whenever this creature attacks, surveil 1."
+1 more matching line
Il Mheg Pixie97%
$0.17↑#130850.101.2 years
"Whenever this creature attacks, surveil 1."
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"Whenever this creature attacks, surveil 1."
Fear of Surveillance97%
$0.22↑#135590.091.9 years
"Whenever this creature attacks, surveil 1."
Shore Lurker87%
$0.09↓#24720↓0.000.6 years
"When this creature enters, surveil 1."
Sanitation Automaton86%
$0.08↓#22325↓0.18↑2.6 years↑
"When this creature enters, surveil 1."
Whisper Agent86%
$0.07↓#23860↓0.43↑7.9 years↑
"When this creature enters, surveil 1."
Wreckage Wickerfolk86%
$0.21↑#141600.151.6 years
"When this creature enters, surveil 2."
+1 more matching line
Watcher in the Mist86%
$0.05↓#28012↓0.007.9 years↑
"When this creature enters, surveil 2."
Sinister Starfish86%
$0.18↑#9367↑0.005.2 years↑
"
: Surveil 1."
: Surveil 1."
Imperious Inkmage86%
$0.05↓#25419↓0.000.4 years↓
"When this creature enters, surveil 2."
Dimir Informant86%
$0.15↓#24240↓0.007.9 years↑
"When this creature enters, surveil 2."
A.I.M. Synthoids86%
$0.11↓#20319↓0.000.2 years↓
"When this creature enters, surveil 2."
Sterling Hound86%
$0.17↑#17278↓0.072.4 years
"When this creature enters, surveil 2."
Wretched Doll86%
$0.15↓#21195↓0.18↑1.6 years
"
, : Surveil 1."
, : Surveil 1."
Ultimecia, Time Sorceress // Ultimecia, Omnipotent84%
$0.24↑#111110.30↑1.2 years
"Whenever this card enters or attacks, surveil 2."
Barrier of Bones84%
$0.08↓#151500.007.9 years↑
"When this creature enters, surveil 1."
Rune-Sealed Wall83%
$0.21↑#108110.061.8 years
": Surveil 1."
: Surveil 1."
Consider82%
$0.29↑#379↑0.114.9 years↑
"Surveil 1."
Underwater Tunnel // Slimy Aquarium82%
$0.18↑#111060.17↑1.9 years
"When you unlock this door, surveil 2."