River Herald Scout 
Creature — Merfolk Scout
$0.16 #16685 0.00 2.8 years
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 Scout 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.
Emissary of Sunrise100%
$0.11↓#27663↓0.22↑8.9 years↑
"When this creature enters, it explores."
Tishana's Wayfinder100%
$0.19↑#21024↓0.44↑8.9 years↑
"When this creature enters, it explores."
Cenote Scout100%
$0.24↑#11569↑0.002.8 years
"When this creature enters, it explores."
Sunrise Seeker100%
$0.05↓#29882↓0.29↑8.9 years↑
"When this creature enters, it explores."
Seekers' Squire100%
$0.12↓#25036↓0.29↑8.9 years↑
"When this creature enters, it explores."
Ixalli's Diviner100%
$0.17↑#22444↓0.058.9 years↑
"When this creature enters, it explores."
Pathfinding Axejaw100%
$0.20↑#160000.002.8 years
"When this creature enters, it explores."
Kinjalli's Dawnrunner100%
$0.09↓#23194↓0.25↑2.8 years
"When this creature enters, it explores."
Brazen Buccaneers100%
$0.21↑#24142↓0.008.9 years↑
"When this creature enters, it explores."
River Herald Guide100%
$0.13↓#180450.002.8 years
"When this creature enters, it explores."
Merfolk Branchwalker100%
$0.26↑#167320.55↑8.9 years↑
"When this creature enters, it explores."
Siren Lookout100%
$0.21↑#20751↓0.008.9 years↑
"When this creature enters, it explores."
Dire Fleet Interloper100%
$0.25↑#24876↓0.50↑8.9 years↑
"When this creature enters, it explores."
Queen's Agent98%
$0.10↓#27509↓0.008.9 years↑
"When this creature enters, it explores."
Jadelight Spelunker96%
$0.31↑#9305↑0.75↑2.8 years
"When this creature enters, it explores X times."
Sanitation Automaton96%
$0.08↓#22325↓0.18↑2.6 years
"When this creature enters, surveil 1."
Whisper Agent96%
$0.07↓#23860↓0.43↑7.9 years↑
"When this creature enters, surveil 1."
Dimir Informant96%
$0.15↓#24240↓0.007.9 years↑
"When this creature enters, surveil 2."
Imperious Inkmage96%
$0.05↓#25419↓0.000.4 years↓
"When this creature enters, surveil 2."
A.I.M. Synthoids96%
$0.11↓#20319↓0.000.2 years↓
"When this creature enters, surveil 2."