Null Chamber 
World Enchantment
$1.44 #25784 0.88 29.9 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%
$1.02↓#14808↑0.8414.9 years↓
"Spells with the chosen name can't be cast."
+1 more matching line
Voidstone Gargoyle92%
$0.28↓#275370.68↓19.6 years↓
"Spells with the chosen name can't be cast."
+1 more matching line
Meddling Mage91%
$1.70↑#17783↑0.8825.6 years↓
"Spells with the chosen name can't be cast."
+1 more matching line
Council of the Absolute90%
$0.36↓#241330.63↓13.3 years↓
"Your opponents can't cast spells with the chosen name."
+1 more matching line
Alhammarret, High Arbiter88%
$0.23↓#19741↑0.57↓11.1 years↓
"Your opponents can't cast spells with the chosen name ."
+1 more matching line
Conjurer's Ban88%
$0.21↓#285260.22↓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."
Gideon's Intervention84%
$0.27↓#207420.56↓9.4 years↓
"As this enchantment enters, choose a card name."
+1 more matching line
Academic Probation78%
$0.17↓#246650.71↓5.4 years↓
"• Choose a nonland card name. Opponents can't cast spells with the chosen name until your next turn."
Failure // Comply76%
$0.31↓#216840.35↓9.4 years↓
"Choose a card name. Until your next turn, your opponents can't cast spells with the chosen name."
Booby Trap70%
$0.45↓#239600.26↓28.9 years↓
"As this artifact enters, choose an opponent and a card name other than a basic land card name."