Metamorphosis Fanatic, Ashnod's Altar, and Lumbering Battlement

Prerequisites

• Metamorphosis Fanatic in hand
• Ashnod's Altar on the battlefield
• Lumbering Battlement in the graveyard
• available

Steps

1. Cast Metamorphosis Fanatic by paying
2. When Metamorphosis Fanatic enters, it triggers, returning Lumbering Battlement from your graveyard to the battlefield
3. When Lumbering Battlement enters, it triggers, exiling Metamorphosis Fanatic until Lumbering Battlement leaves the battlefield
4. Activate Ashnod's Altar by sacrificing Lumbering Battlement
5. When Lumbering Battlement 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