The brilliance of this combination lies in how Gogo, Master of Mimicry turns a slow, incremental win condition into a sudden, game-ending strike. When Etrata, the Silencer slips past defenses and connects for combat damage, her triggered ability normally exiles just one creature and shuffles her away, requiring three separate attacks to trigger her alternate-win clause. By using Gogo's activated ability to multiply that single trigger, you instantly exile three creatures, place hit counters on all of them, and fulfill the requirement for that opponent to lose the game all in one decisive blow.