Thirst for Knowledge 
Instant
$0.20 #1985 0.09 23.0 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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"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."
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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%
$0.28↑#13674↓0.005.5 years↓
"Draw four cards. Then discard two cards unless you discard an instant or sorcery card."
Tezzeret, Betrayer of Flesh72%
$0.52↑#4068↓0.36↑4.7 years↓
"+1: Draw two cards. Then discard two cards unless you discard an artifact card."
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$0.18↓#940↑0.109.5 years↓
"Draw X cards, then discard a card."
Prying Eyes72%
$0.05↓#23198↓0.157.7 years↓
"Draw four cards, then discard two cards."
Thoughtflare72%
$0.17↓#20350↓0.1314.0 years↓
"Draw four cards, then discard two cards."
Artificer's Epiphany70%
$0.09↓#14307↓0.0711.3 years↓
"Draw two cards. If you control no artifacts, discard a card."