Creature — Human Peasant
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Instant — Adventure
Destroy target creature with power 4 or greater. (Then exile this card. You may cast the creature later from exile.)
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.