Pithing Needle 
Artifact
$0.40 #6460 0.78 21.3 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↓#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
Disruptor Flute96%
$1.50↑#74400.43↓2.2 years↓
"As this artifact enters, choose a card name."
+1 more matching line
Phyrexian Revoker96%
$0.21↓#53880.60↓15.6 years↓
"Activated abilities of sources with the chosen name can't be activated."
+1 more matching line
Petrified Hamlet92%
$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
Voidstone Gargoyle88%
$0.28↓#27537↓0.6819.6 years↓
"Activated abilities of sources with the chosen name can't be activated."
+1 more matching line
Cursed Totem86%
$1.47↑#2628↑1.32↑29.9 years↑
"Activated abilities of creatures can't be activated."
Anointed Peacekeeper86%
$0.32↓#18756↓1.00↑4.0 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↓#18883↓0.29↓18.3 years↓
"As this enchantment enters, choose a card name."
Skyseer's Chariot80%
$0.18↓#17624↓0.37↓1.6 years↓
"Activated abilities of sources with the chosen name cost more to activate."
more to activate."+1 more matching line
Scheming Fence80%
$0.32↓#12356↓0.94↑4.4 years↓
"Activated abilities of the chosen permanent can't be activated."
+1 more matching line
Declaration of Naught78%
$16.00↑#18265↓0.62↓18.6 years↓
"As this enchantment enters, choose a card name."
Booby Trap77%
$0.45↑#23960↓0.26↓28.9 years↑
"As this artifact enters, choose an opponent and a card name other than a basic land card name."
Curse of Silence74%
$0.33↓#11813↓0.834.9 years↓
"As this Aura enters, choose a card name."
Drana and Linvala72%
$6.39↑#1902↑0.98↑3.4 years↓
"Activated abilities of creatures your opponents control can't be activated."
Suppression Field72%
$0.61↑#13539↓1.05↑20.9 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%
$0.24↓#20044↓0.38↓3.2 years↓
"Activated abilities of lands your opponents control can't be activated unless they're mana abilities."