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.