Enchantment
Cumulative
upkeep
(At
the
beginning
of
your
upkeep,
put
an
age
counter
on
this
permanent,
then
sacrifice
it
unless
you
pay
its
upkeep
cost
for
each
age
counter
on
it.)
As
this
enchantment
enters,
choose
a
color.
:
The
next
time
a
source
of
your
choice
of
the
chosen
color
would
deal
damage
to
you
this
turn,
prevent
that
damage.