Mm'menon, Uthros Exile, Lesser Masticore, and Phantom Train

Prerequisites

• Mm'menon, Uthros Exile on the battlefield
• Lesser Masticore on the battlefield
• Phantom Train on the battlefield

Steps

1. Activate Phantom Train by sacrificing Lesser Masticore
2. When Lesser Masticore dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When Lesser Masticore enters, Mm'menon triggers, putting a +1/+1 counter on Lesser Masticore
4. Resolve the Phantom Train ability
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on a creature