Juwel, Master Crafter

{w/u} : Exile target artifact. Return it to the
battle field under its owners control at the end of
your next turn.
{u}{w} : Place a copy of an artifact you control in
exile on to the battle field. Remove it at the end
of you turn.
{2}{u}{u}{w}{w} {t} : Cast target artifact you control
from exile for free then make two copies of that
artifact. If you control no artifact in exile, exile all artifact you control and exile Juwel.