Loyal Retainers + Karmic Guide + Moritte of the Frost + Phantom Train

Loyal Retainers

Karmic Guide

Moritte of the Frost

Phantom Train

How it works

1. Activate Loyal Retainers by sacrificing it, returning Moritte of the Frost from your graveyard to the battlefield as a copy of Karmic Guide.
2. When Moritte of the Frost enters the battlefield, it triggers, returning Loyal Retainers from your graveyard to the battlefield.
3. Activate Phantom Train by sacrificing Moritte of the Frost.
4. Repeat.

This brilliant loop exploits Moritte of the Frost's unique copy ability to create a recursive engine using Karmic Guide and Loyal Retainers. When you sacrifice Loyal Retainers, you resurrect Moritte as a copy of Karmic Guide, whose enter-the-battlefield trigger immediately brings Loyal Retainers right back to your graveyard. To keep the chain going, Phantom Train steps in as a repeatable sacrifice outlet that bins the Moritte-copy, resetting the graveyard and allowing you to loop the process indefinitely.