Thirst for Knowledge 
Instant
$0.13 #2028 0.09 22.9 years
Draw three cards. Then discard two cards unless you discard an artifact card.
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Cards similar to Thirst for Knowledge 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 three cards. Then discard two cards unless you discard a creature card."
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"Draw three cards. Then discard two cards unless you discard a creature card."
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"When this card enters, draw two cards. Then discard two cards unless you discard an artifact card."
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"Draw three cards. If you control no artifacts, discard a card."
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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 a creature card."
Thirst for Discovery82%
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"Draw three cards. Then discard two cards unless you discard a basic land card."
Compulsive Research80%
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"Target player draws three cards. Then that player discards two cards unless they discard a land card."
Practical Research77%
$0.26↑#13441↓0.26↑5.4 years↓
"Draw four cards. Then discard two cards unless you discard an instant or sorcery card."
Tezzeret, Betrayer of Flesh72%
$0.46↑#3960↓0.30↑4.5 years↓
"+1: Draw two cards. Then discard two cards unless you discard an artifact card."
Pull from Tomorrow72%
$0.20↑#934↑0.169.4 years↓
"Draw X cards, then discard a card."
Thoughtflare72%
$0.11↓#19962↓0.65↑13.9 years↓
"Draw four cards, then discard two cards."
Prying Eyes72%
$0.07↓#22970↓0.24↑7.6 years↓
"Draw four cards, then discard two cards."
Artificer's Epiphany70%
$0.08↓#14137↓0.30↑11.1 years↓
"Draw two cards. If you control no artifacts, discard a card."