Glistener Seer 
Creature — Phyrexian Advisor
This creature enters with three oil counters on it.
{T}, Remove an oil counter from this creature: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)
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Cards that do something similar 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.
Atraxa's Skitterfang 100%
$0.21#10580
"This creature enters with three oil counters on it."
+1 more matching line
Gitaxian Raptor 100%
$0.07#24496
"This creature enters with three oil counters on it."
+1 more matching line
Axiom Engraver 99%
$0.11#20377
"This creature enters with two oil counters on it."
+1 more matching line
Necrosquito 99%
$0.25#14969
"This creature enters with two oil counters on it."
+1 more matching line
Furnace Strider 99%
$0.14#22269
"This creature enters with two oil counters on it."
+1 more matching line
Archfiend of the Dross 88%
$0.36#6714
"This creature enters with four oil counters on it."
+1 more matching line
Evolved Spinoderm 88%
$0.21#21101
"This creature enters with four oil counters on it."
+1 more matching line