Metamorphosis Fanatic, Ashnod's Altar, and Mardu Siegebreaker

Prerequisites

• Metamorphosis Fanatic in hand
• Ashnod's Altar 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 Ashnod's Altar 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

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana