Declaration of Naught 

Enchantment
$15.06 #18330 1.00 18.7 years
As this enchantment enters, choose a card name.
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Cards similar to Declaration of Naught 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 Needle79%
$0.40↓#6545↑0.89↓21.4 years↑
"As this artifact enters, choose a card name."
+1 more matching line
Disruptor Flute78%
$1.96↓#7309↑1.13↑2.3 years↓
"As this artifact enters, choose a card name."
+1 more matching line
Vodalian Mage75%
$0.16↓#23816↓0.35↓32.0 years↑
"
,
: Counter target spell unless its controller pays
."
Disruptive Student74%
$0.20↓#207900.83↓28.0 years↑
"
: Counter target spell unless its controller pays
."
Silverquill Silencer74%
$0.19↓#24660↓0.44↓5.5 years↓
"As this creature enters, choose a nonland card name."
Hisoka, Minamo Sensei74%
$0.33↓#27249↓0.69↓22.1 years↑
"
, Discard a card: Counter target spell if it has the same mana value as the discarded card."
Phyrexian Revoker72%
$0.21↓#5558↑0.41↓15.7 years↓
"As this creature enters, choose a nonland card name."
+1 more matching line
Skyseer's Chariot72%
$0.18↓#176850.32↓1.7 years↓
"As this Vehicle enters, choose a nonland card name."
+1 more matching line
Booby Trap72%
$0.59↓#24178↓0.16↓29.0 years↑
"As this artifact enters, choose an opponent and a card name other than a basic land card name."
Jester's Scepter72%
$0.45↓#23649↓0.30↓20.2 years↑
"
,
, Put a card exiled with this artifact into its owner's graveyard: Counter target spell if it has the same name as that card."
Gideon's Intervention70%
$0.26↓#208830.949.5 years↓
"As this enchantment enters, choose a card name."
+1 more matching line
Disruptive Pitmage70%
$0.14↓#179540.53↓24.0 years↑
"
: Counter target spell unless its controller pays
."
Mundungu70%
$0.32↓#24648↓0.25↓29.7 years↑
"
: Counter target spell unless its controller pays
and 1 life."