Archive Trap 
Instant — Trap
$0.92 #5757 0.24 16.9 years
If an opponent searched their library this turn, you may pay 
rather than pay this spell's mana cost.
rather than pay this spell's mana cost.Target opponent mills thirteen cards.
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Cards similar to Archive Trap 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.
Mind Sculpt80%
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"Target opponent mills seven cards."
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"If an opponent had three or more cards put into their graveyard from anywhere this turn, you may pay rather than pay this spell's mana cost."
rather than pay this spell's mana cost."
Shadow of Doubt74%
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"Players can't search libraries this turn."
Mindlock Orb74%
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"Players can't search libraries."
Nimana Skydancer72%
$0.08↓#22966↓0.205.9 years↓
"When this creature enters, target opponent mills two cards."
Mindbreak Trap70%
$8.20↑#545↑0.76↑16.9 years
"If an opponent cast three or more spells this turn, you may pay rather than pay this spell's mana cost."
rather than pay this spell's mana cost."
Stranglehold70%
$7.35↑#66050.70↑15.2 years↓
"Your opponents can't search libraries."