Eidolon of Rhetoric 
Enchantment Creature — Spirit
$0.55 #3570 1.56 12.5 years
Each player can't cast more than one spell each turn.
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Rule of Law100%
$0.42↓#34691.81↑23.0 years↑
"Each player can't cast more than one spell each turn."
Arcane Laboratory100%
$0.52↓#9832↓1.68↑28.0 years↑
"Each player can't cast more than one spell each turn."
Deafening Silence97%
$1.12↑#1972↑1.71↑7.0 years↓
"Each player can't cast more than one noncreature spell each turn."
High Noon96%
$4.44↑#7845↓1.24↓2.5 years↓
"Each player can't cast more than one spell each turn."
Archon of Emeria94%
$1.04↑#2143↑1.596.1 years↓
"Each player can't cast more than one spell each turn."
Phyrexian Censor91%
$0.35↓#4553↓1.16↓3.5 years↓
"Each player can't cast more than one non-Phyrexian spell each turn."
Curse of Exhaustion90%
$0.38↓#9065↓1.40↓14.7 years↑
"Enchanted player can't cast more than one spell each turn."
Ethersworn Canonist84%
$2.68↑#2812↑1.40↓18.0 years↑
"Each player who has cast a nonartifact spell this turn can't cast additional nonartifact spells."
Moderation81%
$0.27↓#15462↓0.39↓5.5 years↓
"You can't cast more than one spell each turn."
Delightful Discovery74%
$0.33↓#15839↓0.06↓1.9 years↓
"This spell costs 
less to cast for each spell your opponents have cast this turn."
less to cast for each spell your opponents have cast this turn."
Damping Sphere73%
$0.64↑#4993↓1.36↓8.5 years↓
"Each spell a player casts costs more to cast for each other spell that player has cast this turn."
more to cast for each other spell that player has cast this turn."
Yawgmoth's Agenda72%
$0.35↓#27179↓0.19↓26.0 years↑
"You can't cast more than one spell each turn."