Disruptor Flute 
Artifact
$1.96 #7309 1.13 2.3 years
Flash
As this artifact enters, choose a card name.
Spells with the chosen name cost 
more to cast.
more to cast.Activated abilities of sources with the chosen name can't be activated unless they're mana abilities.
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Cards similar to Disruptor Flute 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.
Pithing Needle96%
$0.40↓#65450.89↓21.4 years↑
"As this artifact enters, choose a card name."
+1 more matching line
Sorcerous Spyglass96%
$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
Phyrexian Revoker94%
$0.21↓#5558↑0.41↓15.7 years↑
"Activated abilities of sources with the chosen name can't be activated."
+1 more matching line
Anointed Peacekeeper92%
$0.30↓#18904↓0.79↓4.1 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."+2 more matching lines
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
Skyseer's Chariot88%
$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
Cursed Totem86%
$1.40↓#2680↑1.56↑30.0 years↑
"Activated abilities of creatures can't be activated."
Curse of Silence85%
$0.35↓#11912↓0.56↓5.1 years↑
"As this Aura enters, choose a card name."
+1 more matching line
Suppression Field84%
$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."
Sphere of Resistance80%
$9.90↑#85021.55↑28.3 years↑
"Spells cost 
more to cast."
more to cast."
Voidstone Gargoyle80%
$0.26↓#27791↓0.80↓19.7 years↑
"Activated abilities of sources with the chosen name can't be activated."
+2 more matching lines
Declaration of Naught78%
$15.06↑#18330↓1.00↓18.7 years↑
"As this enchantment enters, choose a card name."
Feroz's Ban74%
$0.35↓#21513↓1.34↑31.1 years↑
"Creature spells cost more to cast."
more to cast."
Geist-Fueled Scarecrow74%
$0.16↓#25418↓0.53↓10.2 years↑
"Creature spells you cast cost more to cast."
more to cast."
Runed Halo74%
$0.15↓#19130↓0.69↓18.5 years↑
"As this enchantment enters, choose a card name."
Tishana's Tidebinder74%
$2.04↑#2819↑0.55↓2.9 years
"Flash"
God-Pharaoh's Statue72%
$0.66↓#2451↑1.60↑7.5 years↑
"Spells your opponents cast cost more to cast."
more to cast."
Drana and Linvala72%
$6.08↑#1944↑1.053.5 years↑
"Activated abilities of creatures your opponents control can't be activated."
Stuck in Summoner's Sanctum72%
$0.16↓#10769↓0.61↓1.4 years
"Flash"
Gloom72%
$0.41↓#25056↓1.2233.2 years↑
"White spells cost more to cast."
more to cast."