Voidstone Gargoyle 
Creature — Gargoyle
$0.26 #27791 0.80 19.7 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
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"Spells with the chosen names can't be cast and lands with the chosen names can't be played."
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"As this creature enters, choose a noncreature, nonland card name."
+2 more matching lines
Pithing Needle88%
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"Activated abilities of sources with the chosen name can't be activated unless they're mana abilities."
+1 more matching line
Meddling Mage88%
$1.46↑#18066↑1.00↑25.7 years↑
"Spells with the chosen name can't be cast."
+1 more matching line
Phyrexian Revoker88%
$0.21↓#5558↑0.41↓15.7 years↓
"As this creature enters, choose a nonland card name."
+1 more matching line
Sorcerous Spyglass86%
$0.08↓#16502↑0.38↓9.1 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%
$0.33↑#18603↑0.60↓11.3 years↓
"Your opponents can't cast spells with the chosen name ."
+1 more matching line
Scheming Fence82%
$0.24↓#12738↑0.60↓4.5 years↓
"As this creature enters, you may choose a nonland permanent."
+1 more matching line
Disruptor Flute80%
$1.96↑#7309↑1.13↑2.3 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%
$0.24↓#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 Intervention78%
$0.26#20883↑0.94↑9.5 years↓
"Your opponents can't cast spells with the chosen name."
+2 more matching lines
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."
+1 more matching line
Petrified Hamlet76%
$0.98↑#9000↑0.41↓0.5 years↓
"Activated abilities of sources with the chosen name can't be activated unless they're mana abilities."
+1 more matching line
Drake Familiar75%
$0.09↓#280360.06↓21.0 years↑
"Flying"
Dawnbreak Reclaimer75%
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"Flying"
Runed Halo72%
$0.15↓#19130↑0.69↓18.5 years↓
"As this enchantment enters, choose a card name."
+1 more matching line
Failure // Comply72%
$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."
Cursed Totem70%
$1.40↑#2680↑1.56↑30.0 years↑
"Activated abilities of creatures can't be activated."
Linvala, Keeper of Silence70%
$20.52↑#2619↑1.44↑16.5 years↓
"Activated abilities of creatures your opponents control can't be activated."