Owlin Historian 
Creature — Bird Cleric
$0.11 #24059 0.00 0.4 years
Flying
When this creature enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
Whenever one or more cards leave your graveyard, this creature gets +1/+1 until end of turn.
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Cards similar to Owlin Historian 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.
Shore Lurker94%
$0.09↓#247200.000.6 years
"When this creature enters, surveil 1."
Wreckage Wickerfolk94%
$0.21↑#14160↑0.15↑1.6 years↑
"When this creature enters, surveil 2."
Watcher in the Mist94%
$0.05↓#280120.007.9 years↑
"When this creature enters, surveil 2."
Sanitation Automaton93%
$0.08↓#223250.18↑2.6 years↑
"When this creature enters, surveil 1."
Whisper Agent93%
$0.07↓#238600.43↑7.9 years↑
"When this creature enters, surveil 1."
Dimir Informant92%
$0.15↑#242400.007.9 years↑
"When this creature enters, surveil 2."
Imperious Inkmage92%
$0.05↓#254190.000.4 years
"When this creature enters, surveil 2."
A.I.M. Synthoids92%
$0.11#203190.000.2 years
"When this creature enters, surveil 2."
Sterling Hound92%
$0.17↑#17278↑0.072.4 years↑
"When this creature enters, surveil 2."
Barrier of Bones90%
$0.08↓#15150↑0.007.9 years↑
"When this creature enters, surveil 1."
Siren Lookout89%
$0.21↑#207510.008.9 years↑
"When this creature enters, it explores."
Dire Fleet Interloper89%
$0.25↑#248760.50↑8.9 years↑
"When this creature enters, it explores."
Attuned Hunter88%
$0.17↑#201270.13↑1.4 years↑
"Whenever one or more cards leave your graveyard during your turn, put a +1/+1 counter on this creature."
Underwater Tunnel // Slimy Aquarium88%
$0.18↑#11106↑0.17↑1.9 years↑
"When you unlock this door, surveil 2."
Emissary of Sunrise88%
$0.11#276630.22↑8.9 years↑
"When this creature enters, it explores."
Ixalli's Diviner88%
$0.17↑#224440.058.9 years↑
"When this creature enters, it explores."
Seekers' Squire88%
$0.12↑#250360.29↑8.9 years↑
"When this creature enters, it explores."
Merfolk Branchwalker88%
$0.26↑#16732↑0.55↑8.9 years↑
"When this creature enters, it explores."
Tishana's Wayfinder88%
$0.19↑#210240.44↑8.9 years↑
"When this creature enters, it explores."
River Herald Guide88%
$0.13↑#18045↑0.002.8 years↑
"When this creature enters, it explores."