Activate Kiki-Jiki by tapping it, creating a token copy of All-Fates Stalker.
When the All-Fates Stalker token enters the battlefield, it triggers, exiling Kiki-Jiki until All-Fates Stalker leaves the battlefield.
Activate Umbral Collar Zealot by sacrificing the All-Fates Stalker token.
When the All-Fates Stalker token dies, Kiki-Jiki is returned from exile to the battlefield.
Resolve the Umbral Collar Zealot ability.
Repeat.
This clever loop revolves around Kiki-Jiki, Mirror Breaker's ability to repeatedly clone All-Fates Stalker, whose entry trigger conveniently tucks Kiki-Jiki safely into exile until the token leaves play. To close the circuit, Umbral Collar Zealot provides the necessary sacrifice outlet, sending the All-Fates Stalker token to the graveyard so Kiki-Jiki can instantly return to the battlefield ready to copy it again. Along the way, the Zealot's sacrifice ability weaponizes this endless cycle to give you infinite surveil, death triggers, and leaves-the-battlefield value.