Soulless Jailer 
Artifact Creature — Phyrexian Golem
$1.31 #3221 0.89 3.6 years
Permanent cards in graveyards can't enter the battlefield.
Players can't cast noncreature spells from graveyards or exile.
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Cards similar to Soulless Jailer 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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"Exile all graveyards. Players can't cast noncreature spells this turn. Exile this card."