Phyrexian Revoker 
Artifact Creature — Phyrexian Horror
$0.21 #5558 0.41 15.7 years
As this creature enters, choose a nonland card name.
Activated abilities of sources with the chosen name can't be activated.
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Cards similar to Phyrexian Revoker 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.
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"Activated abilities of sources with the chosen name can't be activated unless they're mana abilities."
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"Activated abilities of sources with the chosen name can't be activated unless they're mana abilities."
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Disruptor Flute94%
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"Activated abilities of sources with the chosen name can't be activated unless they're mana abilities."
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"As this creature enters, choose a nonland card name."
+1 more matching line
Petrified Hamlet88%
$0.98↑#9000↓0.410.5 years↓
"Activated abilities of sources with the chosen name can't be activated unless they're mana abilities."
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"As this Vehicle enters, choose a nonland card name."
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"Activated abilities of creatures can't be activated."
Anointed Peacekeeper81%
$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."+1 more matching line
Meddling Mage80%
$1.46↑#18066↓1.00↑25.7 years↑
"As this creature enters, choose a nonland card name."
+1 more matching line
Scheming Fence80%
$0.24↑#12738↓0.60↑4.5 years↓
"As this creature enters, you may choose a nonland permanent."
+1 more matching line
Silverquill Silencer77%
$0.19↓#24660↓0.445.5 years↓
"As this creature enters, choose a nonland card name."
Runed Halo74%
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"As this enchantment enters, choose a card name."
+1 more matching line
Declaration of Naught72%
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"As this enchantment enters, choose a card name."
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Nevermore72%
$2.03↑#14725↓1.25↑15.1 years
"As this enchantment enters, choose a nonland card name."
+1 more matching line
Drana and Linvala71%
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"Activated abilities of creatures your opponents control can't be activated."
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"Activated abilities of artifacts can't be activated."