Szarel, Genesis Shepherd + Animation Module + Sword of the Meek + Phyrexian Altar + Phantom Train

Szarel, Genesis Shepherd

Animation Module

Sword of the Meek

Phyrexian Altar

Phantom Train

How it works

1. Activate Phantom Train 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 Phantom Train ability.
6. Activate Phyrexian Altar by sacrificing the Servo, adding 1.
7. Repeat.

This loop kicks off by feeding Sword of the Meek to Phantom Train, a sacrifice that immediately awakens Szarel, Genesis Shepherd to shower your board with +1/+1 counters. Those incoming counters prompt Animation Module to offer a cheap mana investment for a brand-new 1/1 Servo artifact creature token. That very same Servo token’s arrival triggers Sword of the Meek to leap straight back out of your graveyard and attach itself to the newcomer, ready to be fed into Phyrexian Altar for the mana needed to sustain the entire engine.