Meddling Mage 
Creature — Human Wizard
$1.46 #18066 1.00 25.7 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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"Spells with the chosen name can't be cast."
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$0.33↓#186030.60↓11.3 years↓
"Your opponents can't cast spells with the chosen name ."
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Phyrexian Revoker80%
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"As this creature enters, choose a nonland card name."
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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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Conjurer's Ban76%
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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."
Academic Probation72%
$0.18↓#24775↓0.33↓5.5 years↓
"• Choose a nonland card name. Opponents can't cast spells with the chosen name until your next turn."
Failure // Comply70%
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"Choose a card name. Until your next turn, your opponents can't cast spells with the chosen name."