Quicksilver, Shifting Slime

When Quicksilver, Shifting slime enters the battlefield, you may search target player's library
for an artifact card an exile it. If you
do, Quicksilver becomes a copy of that
artifact except its name is still Quicksilver,
Shifting Slime and it's still legendary.
When Quicksilver is put into a graveyard from the battlefield, put all cards exiled with it into their
owners' graveyards.