Jaqen H'ghar

You may have Jaqen H'ghar enter the battlefield
as a copy of any creature on the battlefield,
except it's legendary in addition to its other types,
and it has "{1}{u}{u}: Return this creature to its
owner's hand at the beginning of the next end
step."
{t}: Destroy target creature with the same name
as Jaqen H'ghar.
"Valar Morghulis."