If an object becomes a copy of an object that has an Adventure, the copy also has an Adventure. If it changes zones, it will either cease to exist (if it's a token) or cease to be a copy (if it's a nontoken permanent), and so you won't be able to cast it as an Adventure.
Ishgard, the Holy See // Faith & Grief
When playing a card as an Adventure, use the alternative characteristics and ignore all of the card's normal characteristics. The resulting spell's color, mana cost, mana value, and so on are determined by only those alternative characteristics. If the spell leaves the stack, it immediately resumes using its normal characteristics.
If an effect instructs you to choose a card name, you may choose the alternative Adventure name. Consider only the alternative characteristics to determine whether that is an appropriate name to choose.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. KOHEI YAMADA
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