Ethersworn Canonist 
Artifact Creature — Human Cleric
$1.95 #2794 1.32 17.9 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%
$1.08↓#1959↑1.48↑6.9 years↓
"Each player can't cast more than one noncreature spell each turn."
Rule of Law84%
$0.52↓#3430↓1.47↑22.9 years↑
"Each player can't cast more than one spell each turn."
Eidolon of Rhetoric84%
$0.46↓#3456↓1.2812.3 years↓
"Each player can't cast more than one spell each turn."
Arcane Laboratory84%
$0.50↓#9704↓1.49↑27.9 years↑
"Each player can't cast more than one spell each turn."
High Noon77%
$4.28↑#7621↓0.89↓2.4 years↓
"Each player can't cast more than one spell each turn."
Archon of Emeria75%
$0.95↓#2098↑1.295.9 years↓
"Each player can't cast more than one spell each turn."
Curse of Exhaustion74%
$0.34↓#8982↓1.2514.6 years↓
"Enchanted player can't cast more than one spell each turn."
Phyrexian Censor72%
$0.30↓#4422↓1.09↓3.4 years↓
"Each player can't cast more than one non-Phyrexian spell each turn."
Lodestone Golem72%
$0.30↓#7156↓0.74↓16.6 years↓
"Nonartifact spells cost more to cast."
more to cast."
Drannith Magistrate70%
$9.54↑#721↑2.46↑6.4 years↓
"Your opponents can't cast spells from anywhere other than their hands."