Null Chamber 
World Enchantment
$1.66 #26041 0.78 30.0 years
As this enchantment enters, you and an opponent each choose a card name other than a basic land card name.
Spells with the chosen names can't be cast and lands with the chosen names can't be played.
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Cards similar to Null Chamber 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.
Nevermore96%
$2.03↑#14725↑1.25↑15.1 years↓
"Spells with the chosen name can't be cast."
+1 more matching line
Voidstone Gargoyle92%
$0.26↓#277910.8019.7 years↓
"Spells with the chosen name can't be cast."
+1 more matching line
Meddling Mage91%
$1.46↓#18066↑1.00↑25.7 years↓
"Spells with the chosen name can't be cast."
+1 more matching line
Council of the Absolute90%
$0.31↓#244660.53↓13.5 years↓
"Your opponents can't cast spells with the chosen name."
+1 more matching line
Alhammarret, High Arbiter88%
$0.33↓#18603↑0.60↓11.3 years↓
"Your opponents can't cast spells with the chosen name ."
+1 more matching line
Conjurer's Ban88%
$0.24↓#289110.35↓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."
Gideon's Intervention84%
$0.26↓#208830.94↑9.5 years↓
"As this enchantment enters, choose a card name."
+1 more matching line
Academic Probation78%
$0.18↓#247750.33↓5.5 years↓
"• Choose a nonland card name. Opponents can't cast spells with the chosen name until your next turn."
Failure // Comply76%
$0.30↓#218790.27↓9.5 years↓
"Choose a card name. Until your next turn, your opponents can't cast spells with the chosen name."
Booby Trap70%
$0.59↓#241780.16↓29.0 years↓
"As this artifact enters, choose an opponent and a card name other than a basic land card name."