Mythos of Nethroi
Instant
Oracle Text
Destroy target nonland permanent if it's a creature or if
was spent to cast this spell.
Rulings (5)
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Wizards of the CoastMythos of Nethroi can target any nonland permanent. Determine as the spell resolves whether the permanent is destroyed, either because it’s a creature at that time or because was spent to cast the spell.
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Wizards of the CoastIf an effect copies the Mythos spell, no mana was spent to cast the copy, so the copy won’t receive the bonus.
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Wizards of the CoastIf an effect allows you to cast a spell without paying its mana cost, you can’t choose to cast it and pay unless another rule or effect allows you to cast that spell for a cost. Similarly, you can’t waive a cost reduction unless that effect says you may.
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Wizards of the CoastThe ability checks what mana was actually spent to cast a spell. If an effect allows you to spend mana “as though it were mana” of any color or type, that allows you to spend mana you couldn’t otherwise spend, but it doesn’t change what mana you spent to cast the spell.
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Wizards of the CoastThe abilities of the Mythos check what colors of mana were spent to cast the spell. It’s not an alternative cost to cast the spell.