Activate Kiki-Jiki by tapping it, creating a token copy of Faceless Butcher.
When the Faceless Butcher token enters the battlefield, it triggers, exiling Kiki-Jiki until Faceless Butcher leaves the battlefield.
Activate Umbral Collar Zealot by sacrificing the Faceless Butcher token.
When the Faceless Butcher token dies, Kiki-Jiki is returned from exile to the battlefield.
Resolve the Umbral Collar Zealot ability.
Repeat.
This ingenious loop centers around Kiki-Jiki, Mirror Breaker's ability to repeatedly churn out hasty replicas, starting with a copy of Faceless Butcher. As the Faceless Butcher token enters the battlefield, its triggered ability tucks Kiki-Jiki safely away into exile, which conveniently dodges any sorcery-speed removal while setting up the exit. From there, Umbral Collar Zealot provides the crucial sacrifice outlet needed to instantly bin the token, letting you surveil 1 along the way. Sacrificing the Faceless Butcher token immediately triggers its return clause, freeing Kiki-Jiki back to the battlefield so the entire process can begin anew.