Szarel, Genesis Shepherd + Animation Module + Sword of the Meek + Phyrexian Altar + Umbral Collar Zealot

Szarel, Genesis Shepherd

Animation Module

Sword of the Meek

Phyrexian Altar

Umbral Collar Zealot

How it works

1. Activate Umbral Collar Zealot by sacrificing Sword of the Meek.
2. When you sacrifice Sword of the Meek, Szarel triggers, putting a number of +1/+1 counters on another creature you control.
3. Animation Module triggers, causing you to pay 1 to create a 1/1 Servo artifact creature token.
4. When the Servo enters the battlefield, Sword of the Meek triggers, returning itself from your graveyard to the battlefield attached to the Servo.
5. Resolve the Umbral Collar Zealot ability.
6. Activate Phyrexian Altar by sacrificing the Servo, adding 1.
7. Repeat.

This loop is a masterclass in recycling, fueled by Umbral Collar Zealot's ability to sacrifice Sword of the Meek for a quick surveil. Because Sword of the Meek automatically leaps back from the graveyard whenever a 1/1 creature enters, sacrificing the resulting Servo token to Phyrexian Altar provides the exact mana needed to pay Animation Module's trigger—which itself fires off every single time Szarel, Genesis Shepherd cascades +1/+1 counters onto your board from the initial sacrifice.