Declaration of Naught 

Enchantment
$16.00 #18265 0.62 18.6 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 Needle78%
$0.40↓#6460↑0.78↑21.3 years↑
"As this artifact enters, choose a card name."
+1 more matching line
Disruptor Flute78%
$1.50↓#7440↑0.43↓2.2 years↓
"As this artifact enters, choose a card name."
+1 more matching line
Vodalian Mage75%
$0.14↓#23508↓0.33↓31.8 years↑
"
,
: Counter target spell unless its controller pays
."
Disruptive Student74%
$0.21↓#205350.14↓27.9 years↑
"
: Counter target spell unless its controller pays
."
Silverquill Silencer74%
$0.20↓#24225↓0.33↓5.4 years↓
"As this creature enters, choose a nonland card name."
Hisoka, Minamo Sensei74%
$0.36↓#26974↓0.29↓21.9 years↑
"
, Discard a card: Counter target spell if it has the same mana value as the discarded card."
Phyrexian Revoker72%
$0.21↓#5388↑0.6015.6 years↓
"As this creature enters, choose a nonland card name."
+1 more matching line
Skyseer's Chariot72%
$0.18↓#176240.37↓1.6 years↓
"As this Vehicle enters, choose a nonland card name."
+1 more matching line
Booby Trap72%
$0.45↓#23960↓0.26↓28.9 years↑
"As this artifact enters, choose an opponent and a card name other than a basic land card name."
Jester's Scepter72%
$0.39↓#25015↓0.19↓20.1 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."
Disruptive Pitmage71%
$0.15↓#176670.15↓23.9 years↑
"
: Counter target spell unless its controller pays
."
Gideon's Intervention70%
$0.27↓#207420.569.4 years↓
"As this enchantment enters, choose a card name."
+1 more matching line
Mundungu70%
$0.32↓#24423↓0.78↑29.6 years↑
"
: Counter target spell unless its controller pays
and 1 life."