Diviner's Lockbox 
Artifact
{1}, {T}: Choose a card name, then reveal the top card of your library. If that card has the chosen name, sacrifice this artifact and draw three cards. Activate only as a sorcery.
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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.