Emperor's Vanguard 
Creature — Human Scout
$0.18 #25146 0.29 8.9 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%
$0.28↑#18926↑0.00↓2.9 years↓
"Whenever this card deals combat damage to a player, it explores."
Basilica Stalker90%
$0.10↓#217220.00↓2.6 years↓
"Whenever this creature deals combat damage to a player, you gain 1 life and surveil 1."
Merfolk Branchwalker90%
$0.26↑#16732↑0.55↑8.9 years
"When this creature enters, it explores."
Seekers' Squire90%
$0.12↓#250360.298.9 years
"When this creature enters, it explores."
Emissary of Sunrise90%
$0.11↓#276630.228.9 years
"When this creature enters, it explores."
Ixalli's Diviner90%
$0.17↓#224440.05↓8.9 years
"When this creature enters, it explores."
River Herald Guide90%
$0.13↓#18045↑0.00↓2.8 years↓
"When this creature enters, it explores."
Tishana's Wayfinder90%
$0.19↑#210240.44↑8.9 years
"When this creature enters, it explores."
River Herald Scout90%
$0.16↓#16685↑0.00↓2.8 years↓
"When this creature enters, it explores."
Sunrise Seeker90%
$0.05↓#298820.298.9 years
"When this creature enters, it explores."
Pathfinding Axejaw90%
$0.20↑#16000↑0.00↓2.8 years↓
"When this creature enters, it explores."
Kinjalli's Dawnrunner90%
$0.09↓#231940.252.8 years↓
"When this creature enters, it explores."
Cenote Scout90%
$0.24↑#11569↑0.00↓2.8 years↓
"When this creature enters, it explores."
Brazen Buccaneers90%
$0.21↑#241420.00↓8.9 years
"When this creature enters, it explores."
Siren Lookout90%
$0.21↑#207510.00↓8.9 years
"When this creature enters, it explores."
Dire Fleet Interloper90%
$0.25↑#248760.50↑8.9 years
"When this creature enters, it explores."
Queen's Agent88%
$0.10↓#275090.00↓8.9 years
"When this creature enters, it explores."
Shore Lurker88%
$0.09↓#247200.00↓0.6 years↓
"When this creature enters, surveil 1."
Whisper Agent88%
$0.07↓#238600.43↑7.9 years↓
"When this creature enters, surveil 1."
Sanitation Automaton88%
$0.08↓#223250.18↓2.6 years↓
"When this creature enters, surveil 1."