Disruptor Flute 
Artifact
$1.50 #7440 0.43 2.2 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↓#64600.78↑21.3 years↑
"As this artifact enters, choose a card name."
+1 more matching line
Sorcerous Spyglass96%
$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
Phyrexian Revoker94%
$0.21↓#5388↑0.60↑15.6 years↑
"Activated abilities of sources with the chosen name can't be activated."
+1 more matching line
Anointed Peacekeeper92%
$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."+2 more matching lines
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
Skyseer's Chariot88%
$0.18↓#17624↓0.371.6 years
"Activated abilities of sources with the chosen name cost more to activate."
more to activate."+1 more matching line
Cursed Totem86%
$1.47↓#2628↑1.32↑29.9 years↑
"Activated abilities of creatures can't be activated."
Curse of Silence85%
$0.33↓#11813↓0.83↑4.9 years↑
"As this Aura enters, choose a card name."
+1 more matching line
Suppression Field84%
$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."
Sphere of Resistance80%
$9.51↑#83611.32↑28.2 years↑
"Spells cost 
more to cast."
more to cast."
Voidstone Gargoyle80%
$0.28↓#27537↓0.68↑19.6 years↑
"Activated abilities of sources with the chosen name can't be activated."
+2 more matching lines
Declaration of Naught78%
$16.00↑#18265↓0.62↑18.6 years↑
"As this enchantment enters, choose a card name."
Lawmage's Binding76%
$0.19↓#16292↓0.31↓7.6 years↑
"Flash"
Feroz's Ban74%
$0.36↓#21359↓1.06↑30.9 years↑
"Creature spells cost more to cast."
more to cast."
Geist-Fueled Scarecrow74%
$0.10↓#25243↓0.3510.1 years↑
"Creature spells you cast cost more to cast."
more to cast."
Runed Halo74%
$0.15↓#18883↓0.29↓18.3 years↑
"As this enchantment enters, choose a card name."
Gloom74%
$0.41↓#24955↓0.98↑33.1 years↑
"White spells cost more to cast."
more to cast."
Tishana's Tidebinder74%
$1.98↑#2768↑0.522.8 years
"Flash"
God-Pharaoh's Statue73%
$0.64↓#2408↑1.32↑7.3 years↑
"Spells your opponents cast cost more to cast."
more to cast."
Drana and Linvala72%
$6.39↑#1902↑0.98↑3.4 years↑
"Activated abilities of creatures your opponents control can't be activated."