Iona, Shield of Emeria
Legendary Creature — Angel
Oracle Text
Flying As Iona enters, choose a color. Your opponents can't cast spells of the chosen color.Rules for this card
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A keyword ability that restricts how a creature may be blocked. See rule 702.9, “Flying.”
Rulings (2)
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Wizards of the CoastIona's third ability includes permanent spells (artifacts, creatures, enchantments, and planeswalkers), not just instant and sorcery spells. It does not include lands or abilities (such as cycling or unearth).
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Wizards of the CoastOnce the color is chosen, it's too late for opponents to respond by casting spells of that color. Iona is not yet in the battlefield at the time the color is chosen, so, for example, there's no way for an opponent to destroy it by casting Doom Blade if the chosen color is black.