Sorcery
Exile
the
top
four
cards
of
your
library
in
a
face-down
pile,
then
exile
the
top
four
cards
of
your
library
in
a
face-up
pile.
An
opponent
chooses
one
of
those
piles.
Put
that
pile
into
your
graveyard.
Look
at
the
cards
in
the
other
pile.
You
may
cast
a
spell
from
among
them
without
paying
its
mana
cost.
Put
the
rest
into
your
hand.