Enchantment — Room
At
the
beginning
of
your
upkeep,
exile
the
top
card
of
your
library.
You
may
play
it
this
turn.
(You
may
cast
either
half.
That
door
unlocks
on
the
battlefield.
As
a
sorcery,
you
may
pay
the
mana
cost
of
a
locked
door
to
unlock
it.)
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