If an effect copies an Adventure spell, that copy is exiled as it resolves. It ceases to exist as a state-based action; it’s not possible to cast the copy from exile.
Horn of Valhalla // Ysgard's Call
An effect may refer to a card, spell, or permanent that “has an Adventure.” This refers to a card, spell, or permanent that has an adventurer card’s set of alternative characteristics, even if they’re not being used and even if that card was never cast as an Adventure.
If you cast an adventurer card as an Adventure, use only its alternative characteristics to determine whether it’s legal to cast that spell.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. John Severin Brassell
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