Sakashima the Impostor

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.”

"What? I just wanted to spar..."