Ethersworn Canonist
Artifact Creature — Human Cleric
Oracle Text
Each player who has cast a nonartifact spell this turn can't cast additional nonartifact spells.Rulings (2)
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Wizards of the CoastEthersworn Canonist takes into account spells that were cast earlier in the turn before Ethersworn Canonist entered the battlefield, including any spells that are somehow still on the stack. However, any spells on the stack as Ethersworn Canonist enters the battlefield have already been cast by that point, so they're not affected by it.
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Wizards of the CoastEach turn, each player can cast any number of artifact spells plus a maximum of one nonartifact spell.