World Enchantment
At
the
beginning
of
each
player's
upkeep,
that
player
chooses
artifact,
creature,
land,
or
non-Aura
enchantment.
All
nontoken
permanents
of
that
type
phase
out.
(While
they're
phased
out,
they're
treated
as
though
they
don't
exist.
Each
one
phases
in
before
its
controller
untaps
during
their
next
untap
step.)