Prevent

all

damage

that

would

be

dealt

to

you

and

planeswalkers

you

control

this

turn

by

sources

you

don't

control.

If

damage

from

a

creature

source

is

prevented

this

way,

Comeuppance

deals

that

much

damage

to

that

creature.

If

damage

from

a

noncreature

source

is

prevented

this

way,

Comeuppance

deals

that

much

damage

to

the

source's

controller.