Metamorphosis Fanatic, Wispweaver Angel, and Yahenni, Undying Partisan

Prerequisites

• Metamorphosis Fanatic on the battlefield
• Wispweaver Angel in hand
• Yahenni, Undying Partisan on the battlefield
• You have enough mana to cast Wispweaver Angel

Steps

1. Cast Wispweaver Angel by paying its mana cost
2. When Wispweaver Angel enters the battlefield, it triggers, targeting Metamorphosis Fanatic
3. Holding priority, activate Yahenni by sacrificing Wispweaver Angel
4. Resolve the Wispweaver Angel ability, blinking Metamorphosis Fanatic
5. When Metamorphosis Fanatic enters the battlefield, it triggers, returning Wispweaver Angel from your graveyard to the battlefield
6. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers