Enchantment
At
the
beginning
of
your
upkeep,
sacrifice
this
enchantment
unless
you
pay
.
Whenever
a
player
puts
an
Island
or
blue
permanent
onto
the
battlefield,
that
player
sacrifices
an
Island
or
blue
permanent
of
their
choice.
Whenever
a
player
puts
a
Swamp
or
black
permanent
onto
the
battlefield,
that
player
sacrifices
a
Swamp
or
black
permanent
of
their
choice.