Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Umbral Collar Zealot, and Marionette Master Combo

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Umbral Collar Zealot, and Marionette Master

Here's how the cards Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Umbral Collar Zealot, and Marionette Master results in Infinite LTB, Infinite ETB, Infinite sacrifice triggers, Infinite death triggers, and Infinite surveil 1

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Umbral Collar Zealot

Marionette Master

Prerequisites

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
Umbral Collar Zealot on the battlefield
Marionette Master on the battlefield

Steps

Activate Umbral Collar Zealot by sacrificing Marionette Master
When Marionette Master dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
When Marionette Master enters, its fabricate ability triggers, putting a +1/+1 counter on it
Resolve the Umbral Collar Zealot ability
Repeat