Soaring Thought-Thief 

Creature — Human Rogue
$0.16 #10829 0.22 5.9 years
Flash
Flying
As long as an opponent has eight or more cards in their graveyard, Rogues you control get +1/+0.
Whenever one or more Rogues you control attack, each opponent mills two cards.
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Cards similar to Soaring Thought-Thief 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.
Thieves' Guild Enforcer82%
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"Whenever this creature or another Rogue you control enters, each opponent mills two cards."
+1 more matching line
Nemesis of Reason73%
$3.24↑#4532↑0.51↑17.3 years↑
"Whenever this creature attacks, defending player mills ten cards."
Tenured Oilcaster72%
$0.13↓#23423↓0.60↑3.4 years↓
"This creature gets +3/+0 as long as an opponent has eight or more cards in their graveyard."
+1 more matching line
Anowon, the Ruin Thief72%
$0.42↑#95040.225.9 years
"Other Rogues you control get +1/+1."
+1 more matching line