You may have Sakashima the Impostor enter as a copy of any creature on the battlefield, except its name is Sakashima the Impostor, it's legendary in addition to its other types, and it has "{2}{U}{U}: Return Sakashima the Impostor to its owner's hand at the beginning of the next end step."
Sakashima the Impostor has 4 listed printings; the most valuable is the Secret Lair printing from SLD at US$36.16 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
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