Meddling Mage 
Creature — Human Wizard
$1.70 #17783 0.88 25.6 years
As this creature enters, choose a nonland card name.
Spells with the chosen name can't be cast.
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Cards similar to Meddling Mage 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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Gideon's Intervention77%
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"Your opponents can't cast spells with the chosen name."
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"Choose a card name. Until your next turn, spells with the chosen name can't be cast and lands with the chosen name can't be played."
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$0.17↓#24665↓0.71↓5.4 years↓
"• Choose a nonland card name. Opponents can't cast spells with the chosen name until your next turn."
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"Choose a card name. Until your next turn, your opponents can't cast spells with the chosen name."