Metamorphosis Fanatic, Restoration Angel, and Yahenni, Undying Partisan

Prerequisites

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

Steps

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

Results

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