Artifact
,
:
Shuffle
your
library,
then
reveal
the
top
card.
Until
end
of
turn,
for
as
long
as
that
card
remains
on
top
of
your
library,
play
with
the
top
card
of
your
library
revealed
and
you
may
play
that
card
without
paying
its
mana
cost.
(If
it
has
X
in
its
mana
cost,
X
is
0.)
