Enchantment — Room
Creature
spells
you
cast
have
convoke.
(Your
creatures
can
help
cast
those
spells.
Each
creature
you
tap
while
casting
a
creature
spell
pays
for
or
one
mana
of
that
creature's
color.)
(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.)
Borderless
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