Nevermore 
Enchantment
$1.02 #14808 0.84 14.9 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%
$0.28↓#27537↓0.68↓19.6 years↑
"Spells with the chosen name can't be cast."
+1 more matching line
Null Chamber96%
$1.44↑#25784↓0.8829.9 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%
$1.70↑#17783↓0.8825.6 years↑
"Spells with the chosen name can't be cast."
+1 more matching line
Council of the Absolute94%
$0.36↓#24133↓0.63↓13.3 years↓
"As this creature enters, choose a noncreature, nonland card name."
+1 more matching line
Alhammarret, High Arbiter90%
$0.23↓#19741↓0.57↓11.1 years↓
"Your opponents can't cast spells with the chosen name ."
+1 more matching line
Gideon's Intervention86%
$0.27↓#20742↓0.56↓9.4 years↓
"Your opponents can't cast spells with the chosen name."
+1 more matching line
Conjurer's Ban83%
$0.21↓#28526↓0.22↓20.6 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%
$0.17↓#24665↓0.71↓5.4 years↓
"• Choose a nonland card name. Opponents can't cast spells with the chosen name until your next turn."
Failure // Comply78%
$0.31↓#21684↓0.35↓9.4 years↓
"Choose a card name. Until your next turn, your opponents can't cast spells with the chosen name."
Silverquill Silencer74%
$0.20↓#24225↓0.33↓5.4 years↓
"As this creature enters, choose a nonland card name."
Phyrexian Revoker72%
$0.21↓#5388↑0.60↓15.6 years
"As this creature enters, choose a nonland card name."
+1 more matching line
Skyseer's Chariot70%
$0.18↓#176240.37↓1.6 years↓
"As this Vehicle enters, choose a nonland card name."
Declaration of Naught70%
$16.00↑#18265↓0.62↓18.6 years↑
"As this enchantment enters, choose a card name."