Preparation cards can only be cast with their base characteristics.
Lorehold Archivist // Restore Relic
Being prepared isn't a copiable value. If a permanent becomes a copy of a prepared creature, it won't be prepared. That permanent will have the alternative characteristics, though, and some other effect could cause it to become prepared later.
A creature without a prepare spell can't become prepared.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Matheus Graef
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