MACH-1, Swooping Scoundrel 
Legendary Artifact Creature — Human Villain
$0.28 #26549 0.00 0.2 years
Flying
When MACH-1 enters and whenever you gain life, surveil 1. This ability triggers only once each turn. (To surveil 1, look at the top card of your library. You may put it into your graveyard.)
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Cards similar to MACH-1, Swooping Scoundrel 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.
Vanguard Seraph97%
$0.19↓#11144↑0.13↑1.8 years↑
"Whenever you gain life for the first time each turn, surveil 1."
Shore Lurker92%
$0.09↓#247200.000.6 years
"When this creature enters, surveil 1."
Watcher in the Mist92%
$0.05↓#280120.007.9 years↑
"When this creature enters, surveil 2."
Wreckage Wickerfolk92%
$0.21↓#14160↑0.15↑1.6 years↑
"When this creature enters, surveil 2."
Whisper Agent92%
$0.07↓#238600.43↑7.9 years↑
"When this creature enters, surveil 1."
Sanitation Automaton92%
$0.08↓#223250.18↑2.6 years↑
"When this creature enters, surveil 1."
Sterling Hound92%
$0.17↓#17278↑0.072.4 years↑
"When this creature enters, surveil 2."
A.I.M. Synthoids92%
$0.11↓#20319↑0.000.2 years
"When this creature enters, surveil 2."
Imperious Inkmage92%
$0.05↓#254190.000.4 years
"When this creature enters, surveil 2."
Dimir Informant92%
$0.15↓#242400.007.9 years↑
"When this creature enters, surveil 2."
Barrier of Bones91%
$0.08↓#15150↑0.007.9 years↑
"When this creature enters, surveil 1."
Underwater Tunnel // Slimy Aquarium90%
$0.18↓#11106↑0.17↑1.9 years↑
"When you unlock this door, surveil 2."
Siren Lookout88%
$0.21↓#20751↑0.008.9 years↑
"When this creature enters, it explores."
Dire Fleet Interloper88%
$0.25↓#248760.50↑8.9 years↑
"When this creature enters, it explores."
Brazen Buccaneers88%
$0.21↓#241420.008.9 years↑
"When this creature enters, it explores."
River Herald Scout88%
$0.16↓#16685↑0.002.8 years↑
"When this creature enters, it explores."
Sunrise Seeker88%
$0.05↓#298820.29↑8.9 years↑
"When this creature enters, it explores."
Cenote Scout88%
$0.24↓#11569↑0.002.8 years↑
"When this creature enters, it explores."
Pathfinding Axejaw88%
$0.20↓#16000↑0.002.8 years↑
"When this creature enters, it explores."
Kinjalli's Dawnrunner88%
$0.09↓#231940.25↑2.8 years↑
"When this creature enters, it explores."