the copy ceases to exist the next time state-based actions are performed
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Remember, even without a Detective, Plutos ability still puts the Item on the top of the deck if not your hand
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of Emet-Selch of the Third Seat's first ability)
Taking a look, the arm shooting out to the right and the pose looks like a previous Ravensburger card used in the Villainous game
There's also some weak cards like Interceptor, Shadow's Hound which is really cool and self-reanimate is thematic, but there's only a single Assassin in the deck (not even a commander) and a 4/3 without evasion is simply not worth getting back anyway