Voidstone Gargoyle 
Creature — Gargoyle
$0.28 #27537 0.68 19.6 years
Flying
As this creature enters, choose a nonland card name.
Spells with the chosen name can't be cast.
Activated abilities of sources with the chosen name can't be activated.
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Cards similar to Voidstone Gargoyle 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%
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"Spells with the chosen name can't be cast."
+1 more matching line
Null Chamber92%
$1.44↑#257840.88↑29.9 years↑
"Spells with the chosen names can't be cast and lands with the chosen names can't be played."
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Council of the Absolute91%
$0.36↑#241330.6313.3 years↓
"As this creature enters, choose a noncreature, nonland card name."
+2 more matching lines
Pithing Needle88%
$0.40↑#6460↑0.7821.3 years↑
"Activated abilities of sources with the chosen name can't be activated unless they're mana abilities."
+1 more matching line
Meddling Mage88%
$1.70↑#17783↑0.88↑25.6 years↑
"Spells with the chosen name can't be cast."
+1 more matching line
Phyrexian Revoker88%
$0.21↓#5388↑0.6015.6 years↓
"As this creature enters, choose a nonland card name."
+1 more matching line
Sorcerous Spyglass86%
$0.08↓#16242↑0.53↓8.9 years↓
"Activated abilities of sources with the chosen name can't be activated unless they're mana abilities."
+1 more matching line
Alhammarret, High Arbiter86%
$0.23↓#19741↑0.57↓11.1 years↓
"Your opponents can't cast spells with the chosen name ."
+1 more matching line
Scheming Fence82%
$0.32↑#12356↑0.94↑4.4 years↓
"As this creature enters, you may choose a nonland permanent."
+1 more matching line
Disruptor Flute80%
$1.50↑#7440↑0.43↓2.2 years↓
"Activated abilities of sources with the chosen name can't be activated unless they're mana abilities."
+2 more matching lines
Conjurer's Ban80%
$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 Intervention78%
$0.27↓#20742↑0.56↓9.4 years↓
"Your opponents can't cast spells with the chosen name."
+2 more matching lines
Academic Probation78%
$0.17↓#246650.715.4 years↓
"• Choose a nonland card name. Opponents can't cast spells with the chosen name until your next turn."
+1 more matching line
Petrified Hamlet76%
$0.82↑#9844↑0.00↓0.4 years↓
"Activated abilities of sources with the chosen name can't be activated unless they're mana abilities."
+1 more matching line
Runed Halo72%
$0.15↓#18883↑0.29↓18.3 years↓
"As this enchantment enters, choose a card name."
+1 more matching line
Failure // Comply72%
$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."
Cursed Totem70%
$1.47↑#2628↑1.32↑29.9 years↑
"Activated abilities of creatures can't be activated."
Silverquill Silencer70%
$0.20↓#242250.33↓5.4 years↓
"As this creature enters, choose a nonland card name."
Linvala, Keeper of Silence70%
$18.85↑#2590↑1.47↑16.4 years↓
"Activated abilities of creatures your opponents control can't be activated."