Vesperlark, Body Double, and Yahenni, Undying Partisan

Prerequisites

• Vesperlark in the graveyard
• Body Double on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Yahenni, Undying Partisan by sacrificing Body Double
2. When Body Double leaves the battlefield, its Vesperlark ability triggers, returning itself from your graveyard to the battlefield as a copy of Vesperlark
3. Resolve the Yahenni, Undying Partisan ability
4. Repeat

Results

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