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Enchantment
When this enchantment enters, exile the top five cards of your library.
Whenever you play a card with the same name as one of the exiled cards, you may put one of those cards with that name into its owner's hand. Then if there are no cards exiled with this enchantment, sacrifice it. If you do, take an extra turn after this one.
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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.
Duplicity 90%
$0.36#31275
"When this enchantment enters, exile the top five cards of your library face down."
Colfenor's Plans 89%
$0.37#18876
"When this enchantment enters, exile the top seven cards of your library face down."
Breaching Dragonstorm 84%
$0.19#4119
"When this enchantment enters, exile cards from the top of your library until you exile a nonland card. You may cast it without paying its mana cost if that spell's mana value is 8 or less. If you don't, put that card into your hand."