Preston, the Vanisher, Ashnod's Altar, Nature's Rhythm, and Metamorphosis Fanatic

Prerequisites

• Preston, the Vanisher on the battlefield
• Ashnod's Altar on the battlefield
• Nature's Rhythm in hand or in the graveyard
• Metamorphosis Fanatic in hand
• at most available

Steps

1. Cast Nature's Rhythm from your hand by paying or from your graveyard for its harmonize cost 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 Ashnod's Altar 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 colorless mana
• Infinite creature tokens
• Infinite death triggers
• Infinite recursion of creature cards in your graveyard
• Infinite sacrifice triggers