Emperor's Vanguard 
Creature — Human Scout
$0.17 #25532 0.11 9.1 years
Whenever this creature deals combat damage to a player, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)
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Cards similar to Emperor's Vanguard 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.
Jenny, Generated Anomaly100%
$0.26↑#19355↑0.29↑3.0 years↓
"Whenever this card deals combat damage to a player, it explores."
River Herald Scout90%
$0.13↓#17084↑0.00↓2.9 years↓
"When this creature enters, it explores."
Pathfinding Axejaw90%
$0.20↑#16452↑0.132.9 years↓
"When this creature enters, it explores."
Brazen Buccaneers90%
$0.22↑#244830.119.1 years
"When this creature enters, it explores."
Ixalli's Diviner90%
$0.18↑#229000.25↑9.1 years
"When this creature enters, it explores."
Sunrise Seeker90%
$0.05↓#302150.00↓9.1 years
"When this creature enters, it explores."
Seekers' Squire90%
$0.11↓#252730.00↓9.1 years
"When this creature enters, it explores."
Tishana's Wayfinder90%
$0.20↑#213420.00↓9.1 years
"When this creature enters, it explores."
Merfolk Branchwalker90%
$0.20↑#16998↑0.00↓9.1 years
"When this creature enters, it explores."
Cenote Scout90%
$0.20↑#11816↑0.00↓2.9 years↓
"When this creature enters, it explores."
Emissary of Sunrise90%
$0.12↓#280410.00↓9.1 years
"When this creature enters, it explores."
River Herald Guide90%
$0.09↓#18470↑0.24↑2.9 years↓
"When this creature enters, it explores."
Kinjalli's Dawnrunner90%
$0.09↓#236760.00↓2.9 years↓
"When this creature enters, it explores."
Siren Lookout90%
$0.23↑#211410.00↓9.1 years
"When this creature enters, it explores."
Dire Fleet Interloper90%
$0.21↑#250870.00↓9.1 years
"When this creature enters, it explores."
Queen's Agent88%
$0.09↓#278320.00↓9.1 years
"When this creature enters, it explores."
Whisper Agent88%
$0.09↓#242230.068.0 years↓
"When this creature enters, surveil 1."
Sanitation Automaton88%
$0.08↓#225720.00↓2.7 years↓
"When this creature enters, surveil 1."
Shore Lurker87%
$0.08↓#244280.070.7 years↓
"When this creature enters, surveil 1."
Imperious Inkmage87%
$0.06↓#251610.130.5 years↓
"When this creature enters, surveil 2."