Siren Lookout 
Creature — Siren Pirate
$0.23 #21141 0.00 9.1 years
Flying
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 Siren Lookout 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.
Dire Fleet Interloper100%
$0.21↓#250870.009.1 years
"When this creature enters, it explores."
Seekers' Squire100%
$0.11↓#252730.009.1 years
"When this creature enters, it explores."
Tishana's Wayfinder100%
$0.20↓#213420.009.1 years
"When this creature enters, it explores."
Merfolk Branchwalker100%
$0.20↓#169980.009.1 years
"When this creature enters, it explores."
Cenote Scout100%
$0.20↓#11816↑0.002.9 years↓
"When this creature enters, it explores."
Emissary of Sunrise100%
$0.12↓#28041↓0.009.1 years
"When this creature enters, it explores."
River Herald Guide100%
$0.09↓#184700.24↑2.9 years↓
"When this creature enters, it explores."
Kinjalli's Dawnrunner100%
$0.09↓#236760.002.9 years↓
"When this creature enters, it explores."
Ixalli's Diviner100%
$0.18↓#229000.25↑9.1 years
"When this creature enters, it explores."
Sunrise Seeker100%
$0.05↓#30215↓0.009.1 years
"When this creature enters, it explores."
River Herald Scout100%
$0.13↓#170840.002.9 years↓
"When this creature enters, it explores."
Pathfinding Axejaw100%
$0.20↓#16452↑0.13↑2.9 years↓
"When this creature enters, it explores."
Brazen Buccaneers100%
$0.22↓#244830.11↑9.1 years
"When this creature enters, it explores."
Queen's Agent98%
$0.09↓#27832↓0.009.1 years
"When this creature enters, it explores."
Shore Lurker96%
$0.08↓#244280.070.7 years↓
"When this creature enters, surveil 1."
+1 more matching line
Watcher in the Mist96%
$0.05↓#28287↓0.008.0 years↓
"When this creature enters, surveil 2."
Wreckage Wickerfolk96%
$0.16↓#14137↑0.001.7 years↓
"When this creature enters, surveil 2."
Jadelight Spelunker96%
$0.30↑#9565↑0.39↑2.9 years↓
"When this creature enters, it explores X times."
Whisper Agent95%
$0.09↓#242230.068.0 years↓
"When this creature enters, surveil 1."
Sanitation Automaton95%
$0.08↓#225720.002.7 years↓
"When this creature enters, surveil 1."