Practical Research 
Instant
$0.26 #13441 0.26 5.4 years
Draw four cards. Then discard two cards unless you discard an instant or sorcery card.
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Cards similar to Practical Research 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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"Draw cards equal to the number of instant and sorcery cards in your graveyard."
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"Draw three cards. Then discard two cards unless you discard an enchantment card."
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"Draw three cards. Then discard two cards unless you discard an artifact card."
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"Draw three cards. Then discard two cards unless you discard a creature card."
Compulsive Research76%
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"Draw four cards, then discard two cards."
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"Draw four cards, then discard two cards."
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"Draw a card, then draw a card for each other instant and sorcery spell you've cast this turn."