Runed Halo 

Enchantment
$0.15 #18883 0.29 18.3 years
As this enchantment enters, choose a card name.
You have protection from the chosen card name. (You can't be targeted, dealt damage, or enchanted by anything with that name.)
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Cards similar to Runed Halo 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 Needle82%
$0.40↑#6460↑0.78↑21.3 years↑
"As this artifact enters, choose a card name."
+1 more matching line
Gideon's Intervention80%
$0.27↑#207420.56↑9.4 years↓
"As this enchantment enters, choose a card name."
+1 more matching line
Declaration of Naught80%
$16.00↑#182650.62↑18.6 years
"As this enchantment enters, choose a card name."
Serra's Emissary79%
$7.36↑#2698↑1.02↑5.3 years↓
"As this creature enters, choose a card type."
+1 more matching line
Seht's Tiger75%
$0.50↑#14014↑0.06↓21.0 years↑
"When this creature enters, you gain protection from the color of your choice until end of turn."
Phyrexian Revoker74%
$0.21↑#5388↑0.60↑15.6 years↓
"As this creature enters, choose a nonland card name."
+1 more matching line
The Stasis Coffin74%
$1.14↑#6752↑0.41↑3.8 years↓
"
,
, Exile this card: You gain protection from everything until your next turn."
Booby Trap74%
$0.45↑#23960↓0.2628.9 years↑
"As this artifact enters, choose an opponent and a card name other than a basic land card name."
Disruptor Flute74%
$1.50↑#7440↑0.43↑2.2 years↓
"As this artifact enters, choose a card name."
+1 more matching line
Voidstone Gargoyle72%
$0.28↑#27537↓0.68↑19.6 years↑
"As this creature enters, choose a nonland card name."
+1 more matching line
The One Ring70%
$100.08↑#91↑2.55↑3.2 years↓
"When this card enters, if you cast it, you gain protection from everything until your next turn."