Perigee Beckoner, Yahenni, Undying Partisan, and Hero of the Dunes

Prerequisites

• Perigee Beckoner in hand
• Yahenni, Undying Partisan on the battlefield
• Hero of the Dunes on the battlefield

Steps

1. Cast Perigee Beckoner for its warp cost by paying
2. When Perigee Beckoner enters, it triggers, targeting Hero of the Dunes
3. Activate Yahenni by sacrificing Perigee Beckoner
4. Activate Yahenni by sacrificing Hero of the Dunes
5. When Hero of the Dunes dies, it triggers, returning itself from your graveyard to the battlefield tapped
6. When Hero of the Dunes enters, it triggers, returning Perigee Beckoner from your graveyard to the battlefield
7. When Perigee Beckoner enters, it triggers, targeting Hero of the Dunes
8. Resolve the Yahenni ability from step 4
9. Repeat from step 3

Results

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