Metamorphosis Fanatic, Phantom Train, and Fiend Hunter

Prerequisites

• Metamorphosis Fanatic in hand
• Phantom Train on the battlefield
• Fiend Hunter in the graveyard
• available

Steps

1. Cast Metamorphosis Fanatic by paying
2. When Metamorphosis Fanatic enters, it triggers, returning Fiend Hunter from your graveyard to the battlefield
3. When Fiend Hunter enters, it triggers, exiling Metamorphosis Fanatic
4. Activate Phantom Train by sacrificing Fiend Hunter
5. When Fiend Hunter dies, it triggers, returning Metamorphosis Fanatic from exile to the battlefield
6. Repeat from step 2
7. Resolve all Phantom Train abilities

Results

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