Enchantment
Convoke
(Your
creatures
can
help
cast
this
spell.
Each
creature
you
tap
while
casting
this
spell
pays
for
or
one
mana
of
that
creature's
color.)
As
this
enchantment
enters,
choose
a
creature
type.
Double
all
damage
that
sources
you
control
of
the
chosen
type
would
deal.
