River Herald Guide 
Creature — Merfolk Scout
$0.09 #18470 0.24 2.9 years
Vigilance
When this creature enters, 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 River Herald Guide 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.
Seekers' Squire100%
$0.11↑#25273↓0.00↓9.1 years↑
"When this creature enters, it explores."
Tishana's Wayfinder100%
$0.20↑#213420.00↓9.1 years↑
"When this creature enters, it explores."
Merfolk Branchwalker100%
$0.20↑#169980.00↓9.1 years↑
"When this creature enters, it explores."
Cenote Scout100%
$0.20↑#11816↑0.00↓2.9 years
"When this creature enters, it explores."
Emissary of Sunrise100%
$0.12↑#28041↓0.00↓9.1 years↑
"When this creature enters, it explores."
Kinjalli's Dawnrunner100%
$0.09#23676↓0.00↓2.9 years
"When this creature enters, it explores."
Ixalli's Diviner100%
$0.18↑#22900↓0.259.1 years↑
"When this creature enters, it explores."
Sunrise Seeker100%
$0.05↓#30215↓0.00↓9.1 years↑
"When this creature enters, it explores."
+1 more matching line
River Herald Scout100%
$0.13↑#170840.00↓2.9 years
"When this creature enters, it explores."
Pathfinding Axejaw100%
$0.20↑#164520.13↓2.9 years
"When this creature enters, it explores."
Brazen Buccaneers100%
$0.22↑#24483↓0.11↓9.1 years↑
"When this creature enters, it explores."
Dire Fleet Interloper100%
$0.21↑#25087↓0.00↓9.1 years↑
"When this creature enters, it explores."
Siren Lookout100%
$0.23↑#211410.00↓9.1 years↑
"When this creature enters, it explores."
Queen's Agent98%
$0.09#27832↓0.00↓9.1 years↑
"When this creature enters, it explores."
Jadelight Spelunker96%
$0.30↑#9565↑0.39↑2.9 years
"When this creature enters, it explores X times."
Whisper Agent96%
$0.09#24223↓0.06↓8.0 years↑
"When this creature enters, surveil 1."
Sanitation Automaton96%
$0.08↓#22572↓0.00↓2.7 years
"When this creature enters, surveil 1."
Imperious Inkmage96%
$0.06↓#25161↓0.13↓0.5 years↓
"When this creature enters, surveil 2."
+1 more matching line
Dimir Informant96%
$0.15↑#24534↓0.00↓8.0 years↑
"When this creature enters, surveil 2."
Sterling Hound96%
$0.15↑#176440.12↓2.5 years
"When this creature enters, surveil 2."