Owl Familiar 
Creature — Bird
$0.10 #20849 0.27 29.5 years
Flying
When this creature enters, draw a card, then discard a card.
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Cards similar to Owl Familiar 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.
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"When this creature enters, draw a card, then discard a card."
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"Draw two cards, then discard two cards."
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"When this card enters, draw a card, then discard a card."
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"When this creature enters, draw a card, then discard a card."
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"Draw a card, then discard a card."
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"Draw two cards, then discard two cards."
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"When this enchantment enters, draw a card, then discard a card."
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"When this creature enters, draw a card, then discard a card."
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"Draw X cards, then discard a card."