Cass, Hand of Vengeance + Ajani's Chosen + Phantom Train

Cass, Hand of Vengeance

Ajani's Chosen

Phantom Train

How it works

1. Activate Phantom Train by sacrificing another creature that has an Aura attached to it.
2. When the creature dies, Cass triggers, returning an Aura that was attached to the creature from your graveyard to the battlefield attached to another creature you control.
3. When the Aura enters the battlefield, Ajani's Chosen triggers, creating a creature token.
4. Resolve the Phantom Train ability.
5. Repeat.

This clever loop uses Phantom Train as a repeatable sacrifice outlet that turns itself into a creature while fueling the engine. When you sacrifice a creature carrying an Aura, Cass, Hand of Vengeance triggers upon its death to pull that Aura straight out of the graveyard and back onto the battlefield. As that Aura re-enters, Ajani's Chosen swoops in to generate a fresh Cat token to keep the cycle going, giving you endless sacrifices and a rapidly growing Phantom Train.