Biblioplex Tomekeeper {4}
Artifact Creature — Construct
When this creature enters, choose up to one —
• Target creature becomes prepared. (Only creatures with prepare spells can become prepared.)
• Target creature becomes unprepared.
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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.
Sawblade Slinger 100%
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"When this creature enters, choose up to one —"
+1 more matching line
Kami of Restless Shadows 89%
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"When this creature enters, choose one —"
+1 more matching line
Fangkeeper's Familiar 89%
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"When this creature enters, choose one —"
+2 more matching lines