Ethersworn Canonist 
Artifact Creature — Human Cleric
$2.68 #2812 1.40 18.0 years
Each player who has cast a nonartifact spell this turn can't cast additional nonartifact spells.
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Cards similar to Ethersworn Canonist 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.
Deafening Silence86%
$1.12↓#1972↑1.71↑7.0 years↓
"Each player can't cast more than one noncreature spell each turn."
Eidolon of Rhetoric84%
$0.55↓#3570↓1.56↑12.5 years↓
"Each player can't cast more than one spell each turn."
Rule of Law84%
$0.42↓#3469↓1.81↑23.0 years↑
"Each player can't cast more than one spell each turn."
Arcane Laboratory84%
$0.52↓#9832↓1.68↑28.0 years↑
"Each player can't cast more than one spell each turn."
High Noon77%
$4.44↑#7845↓1.24↓2.5 years↓
"Each player can't cast more than one spell each turn."
Archon of Emeria75%
$1.04↓#2143↑1.59↑6.1 years↓
"Each player can't cast more than one spell each turn."
Curse of Exhaustion74%
$0.38↓#9065↓1.4014.7 years↓
"Enchanted player can't cast more than one spell each turn."
Phyrexian Censor72%
$0.35↓#4553↓1.16↓3.5 years↓
"Each player can't cast more than one non-Phyrexian spell each turn."
Lodestone Golem72%
$0.30↓#7250↓0.75↓16.7 years↓
"Nonartifact spells cost more to cast."
more to cast."