Creature — Shade Warlock
When
this
creature
enters,
exile
all
opponents'
graveyards.
Choose
a
nonland
card
exiled
this
way.
You
may
cast
that
card
for
as
long
as
it
remains
exiled,
and
you
may
spend
mana
as
though
it
were
mana
of
any
color
to
cast
that
spell.
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