Phyrexian Revoker 
Artifact Creature — Phyrexian Horror
$0.21 #5388 0.60 15.6 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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$0.40↑#64600.78↑21.3 years↑
"Activated abilities of sources with the chosen name can't be activated unless they're mana abilities."
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Sorcerous Spyglass96%
$0.08↓#16242↓0.538.9 years↓
"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."
+1 more matching line
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$0.28↑#27537↓0.6819.6 years↑
"As this creature enters, choose a nonland card name."
+1 more matching line
Petrified Hamlet88%
$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 Chariot85%
$0.18↓#17624↓0.37↓1.6 years↓
"As this Vehicle enters, choose a nonland card name."
+1 more matching line
Cursed Totem84%
$1.47↑#2628↑1.32↑29.9 years↑
"Activated abilities of creatures can't be activated."
Anointed Peacekeeper81%
$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
Meddling Mage80%
$1.70↑#17783↓0.88↑25.6 years↑
"As this creature enters, choose a nonland card name."
+1 more matching line
Scheming Fence80%
$0.32↑#12356↓0.94↑4.4 years↓
"As this creature enters, you may choose a nonland permanent."
+1 more matching line
Silverquill Silencer77%
$0.20↓#24225↓0.33↓5.4 years↓
"As this creature enters, choose a nonland card name."
Runed Halo74%
$0.15↓#18883↓0.29↓18.3 years↑
"As this enchantment enters, choose a card name."
+1 more matching line
Declaration of Naught72%
$16.00↑#18265↓0.6218.6 years↑
"As this enchantment enters, choose a card name."
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Nevermore72%
$1.02↑#14808↓0.84↑14.9 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."