wotc
If an effect allows you to cast a spell with {X} in its cost without paying its mana cost, you must choose 0 for the value of X.
If an effect allows you to cast a spell with {X} in its cost without paying its mana cost, you must choose 0 for the value of X.
When you cast a spell without paying its mana cost, you may still pay additional costs. If any additional costs are required, you must pay them.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Steven Belledin
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