Pithing Needle 
Artifact
$0.40 #6545 0.89 21.4 years
As this artifact enters, choose a card name.
Activated abilities of sources with the chosen name can't be activated unless they're mana abilities.
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Cards similar to Pithing Needle 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.
Sorcerous Spyglass99%
$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
Disruptor Flute96%
$1.96↑#73091.13↑2.3 years↓
"As this artifact enters, choose a card name."
+1 more matching line
Phyrexian Revoker96%
$0.21↓#55580.41↓15.7 years↓
"Activated abilities of sources with the chosen name can't be activated."
+1 more matching line
Petrified Hamlet92%
$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
Voidstone Gargoyle88%
$0.26↓#27791↓0.8019.7 years↓
"Activated abilities of sources with the chosen name can't be activated."
+1 more matching line
Cursed Totem86%
$1.40↑#2680↑1.56↑30.0 years↑
"Activated abilities of creatures can't be activated."
Anointed Peacekeeper86%
$0.30↓#18904↓0.794.1 years↓
"Activated abilities of sources with the chosen name cost 
more to activate unless they're mana abilities."
more to activate unless they're mana abilities."+1 more matching line
Runed Halo82%
$0.15↓#19130↓0.69↓18.5 years↓
"As this enchantment enters, choose a card name."
Skyseer's Chariot80%
$0.18↓#17685↓0.32↓1.7 years↓
"Activated abilities of sources with the chosen name cost more to activate."
more to activate."+1 more matching line
Scheming Fence80%
$0.24↓#12738↓0.60↓4.5 years↓
"Activated abilities of the chosen permanent can't be activated."
+1 more matching line
Declaration of Naught79%
$15.06↑#18330↓1.00↑18.7 years↓
"As this enchantment enters, choose a card name."
Booby Trap77%
$0.59↑#24178↓0.16↓29.0 years↑
"As this artifact enters, choose an opponent and a card name other than a basic land card name."
Curse of Silence74%
$0.35↓#11912↓0.56↓5.1 years↓
"As this Aura enters, choose a card name."
Drana and Linvala72%
$6.08↑#1944↑1.05↑3.5 years↓
"Activated abilities of creatures your opponents control can't be activated."
Suppression Field72%
$0.66↑#13691↓1.35↑21.0 years
"Activated abilities cost more to activate unless they're mana abilities."
more to activate unless they're mana abilities."
Sharkey, Tyrant of the Shire71%
$0.23↓#20324↓0.823.3 years↓
"Activated abilities of lands your opponents control can't be activated unless they're mana abilities."