Weathered Runestone 
Artifact
$0.37 #8347 1.02 5.7 years
Nonland permanent 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 Weathered Runestone 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.
Grafdigger's Cage98%
$2.27↑#2161↑1.20↑14.7 years↑
"Players can't cast spells from graveyards or libraries."
+1 more matching line
Kunoros, Hound of Athreos92%
$0.41↑#93660.77↓6.7 years↑
"Players can't cast spells from graveyards."
+1 more matching line
Soulless Jailer82%
$1.23↑#3314↑1.093.7 years↓
"Players can't cast noncreature spells from graveyards or exile."
+1 more matching line
Ashes of the Abhorrent79%
$0.70↑#83120.81↓9.1 years↑
"Players can't cast spells from graveyards or activate abilities of cards in graveyards."
Shaman's Trance74%
$0.66↑#25922↓0.41↓24.4 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."