Metamorphosis Fanatic, Phantom Train, and Mardu Siegebreaker

Prerequisites

• Metamorphosis Fanatic in hand
• Phantom Train on the battlefield
• Mardu Siegebreaker in the graveyard
• available

Steps

1. Cast Metamorphosis Fanatic by paying
2. When Metamorphosis Fanatic enters, it triggers, returning Mardu Siegebreaker from your graveyard to the battlefield
3. When Mardu Siegebreaker enters, it triggers, exiling Metamorphosis Fanatic until Mardu Siegebreaker leaves the battlefield
4. Activate Phantom Train by sacrificing Mardu Siegebreaker
5. When Mardu Siegebreaker leaves the battlefield, Metamorphosis Fanatic is returned 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