Arya Stark, Faceless Assassin

You may have Sakashima ETB 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 this creature to its owner's
hand at the beginning of the next end step."

"With the faces I can chose. I can become someone else."—No One