Enchantment
Whenever
a
nontoken
creature
enters,
its
controller
creates
a
token
that's
a
copy
of
that
creature.
Whenever
a
nontoken
creature
leaves
the
battlefield,
exile
all
tokens
with
the
same
name
as
that
creature.
When
this
enchantment
leaves
the
battlefield,
exile
all
tokens
created
with
this
enchantment.