Trade Involving Kris Bryant, Clayton Kershaw

I am currently in 2nd place in a head to head league. My offense ranks either last or second to last in each category - but get lucky week to week it seems.

I was offered the following trade:

I receive:
Nick Castellanos
Giancarlo Stanton
Clayton Kershaw

I give up:
Kris Bryant
Jon Lester

Current Team:
C - Willson Contreras
1B - Adrian Gonzalez
2B - Jose Ramirez
3B - Kris Bryant
SS - Elvis Andrus
OF - Rajai Davis
OF - Michael Saunders
OF - Ben Revere
UTIL - Didi Gregorius
UTIL - Chris Carter
DL - JD Martinez
DL - AJ Pollack

SP - Noah Syndergaard
SP - Jon Lester
SP - Drew Pomeranz
SP - Yu Darvish
SP - Tyler Glasnow
SP - Bud Norris
SP - Danny Duffy
RP - Zach Britton
RP - Aroldis Chapman
RP - Arodys Vizcaino
RP - Sam Dyson
RP - Alex Colome
RP - Jeremy Jeffress


What would you guys do?