Nevermore 
Enchantment
$2.03 #14725 1.25 15.1 years
As this enchantment enters, choose a nonland card name.
Spells with the chosen name can't be cast.
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Cards similar to Nevermore 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.
Voidstone Gargoyle96%
$0.26↓#27791↓0.80↓19.7 years↑
"Spells with the chosen name can't be cast."
+1 more matching line
Null Chamber96%
$1.66↓#26041↓0.78↓30.0 years↑
"Spells with the chosen names can't be cast and lands with the chosen names can't be played."
+1 more matching line
Meddling Mage95%
$1.46↓#18066↓1.00↓25.7 years↑
"Spells with the chosen name can't be cast."
+1 more matching line
Council of the Absolute94%
$0.31↓#24466↓0.53↓13.5 years↓
"As this creature enters, choose a noncreature, nonland card name."
+1 more matching line
Alhammarret, High Arbiter90%
$0.33↓#18603↓0.60↓11.3 years↓
"Your opponents can't cast spells with the chosen name ."
+1 more matching line
Gideon's Intervention86%
$0.26↓#20883↓0.94↓9.5 years↓
"Your opponents can't cast spells with the chosen name."
+1 more matching line
Conjurer's Ban83%
$0.24↓#28911↓0.35↓20.7 years↑
"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 Probation81%
$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 // Comply78%
$0.30↓#21879↓0.27↓9.5 years↓
"Choose a card name. Until your next turn, your opponents can't cast spells with the chosen name."
Silverquill Silencer74%
$0.19↓#24660↓0.44↓5.5 years↓
"As this creature enters, choose a nonland card name."
Phyrexian Revoker72%
$0.21↓#5558↑0.41↓15.7 years
"As this creature enters, choose a nonland card name."
+1 more matching line
Skyseer's Chariot70%
$0.18↓#17685↓0.32↓1.7 years↓
"As this Vehicle enters, choose a nonland card name."
Declaration of Naught70%
$15.06↑#18330↓1.00↓18.7 years↑
"As this enchantment enters, choose a card name."