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Rulings
A face-down creature has a converted mana cost of 0. However, its converted mana cost changes when it’s turned face up. Thus, if a creature is turned face up in response to being targeted by Noxious Dragon’s ability, it may become an illegal target.
If a creature on the battlefield has in its mana cost, X is considered to be 0.
If a creature on the battlefield has in its mana cost, X is considered to be 0.
Rulings
A face-down creature has a converted mana cost of 0. However, its converted mana cost changes when it’s turned face up. Thus, if a creature is turned face up in response to being targeted by Noxious Dragon’s ability, it may become an illegal target.
If a creature on the battlefield has in its mana cost, X is considered to be 0.
If a creature on the battlefield has in its mana cost, X is considered to be 0.
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