Artifact Creature — Shapeshifter 2/4, 6 (6)
Rare
Imprint — When Duplicant enters the battlefield, you may exile target nontoken creature.
As long as the exiled card is a creature card, Duplicant has that card's power, toughness, and creature types. It's still a Shapeshifter.
Illus. Thomas M. Baxa

12/1/2004: If no creature card is imprinted on Duplicant, it has its normal power, toughness, and creature types.
12/1/2004: Duplicant's power and toughness change to the imprinted card's power and toughness. Counters and other effects that change Duplicant's power and toughness still apply.
12/1/2004: Duplicant keeps all creature types it had when the card was imprinted, including any types that Duplicant had gained.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern