Preston, the Vanisher, Altar of Dementia, Chord of Calling, and Metamorphosis Fanatic

Prerequisites

• Preston, the Vanisher on the battlefield
• Altar of Dementia on the battlefield
• Chord of Calling in hand
• Metamorphosis Fanatic in hand
• at most available

Steps

1. Cast Chord of Calling by paying at most , searching your library for Metamorphosis Fanatic and putting it onto the battlefield
2. When Metamorphosis Fanatic enters, it and Preston trigger
3. Resolve the Metamorphosis Fanatic trigger, returning an applicable target from your graveyard to the battlefield
4. Holding priority, activate Altar of Dementia by sacrificing Metamorphosis Fanatic
5. Resolve the Preston trigger, creating a token copy of Metamorphosis Fanatic that is a 0/1 Illusion
6. When the Metamorphosis Fanatic token enters, it triggers, returning Metamorphosis Fanatic from your graveyard to the battlefield
7. Repeat from step 2

Results

• Infinite ETB
• Infinite LTB
• Infinite creature tokens
• Infinite death triggers
• Infinite mill
• Infinite recursion of creature cards in your graveyard
• Infinite sacrifice triggers
• Infinite self-mill