Grafdigger's Cage 
Artifact
$1.94 #2085 0.95 14.6 years
Creature cards in graveyards and libraries can't enter the battlefield.
Players can't cast spells from graveyards or libraries.
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Cards similar to Grafdigger's Cage 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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"Players can't cast spells from graveyards or libraries."
+1 more matching line
Kunoros, Hound of Athreos94%
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"Creature cards in graveyards can't enter the battlefield."
+1 more matching line
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"Players can't cast noncreature spells from graveyards or exile."
+1 more matching line
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Shaman's Trance76%
$0.65↓#25621↓0.56↓24.3 years↑
"Other players can't play lands or cast spells from their graveyards this turn. You may play lands and cast spells from other players' graveyards this turn as though those cards were in your graveyard."