Perigee Beckoner, Ashnod's Altar, and Hero of the Dunes

Prerequisites

• Perigee Beckoner in hand
• Ashnod's Altar 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 Ashnod's Altar by sacrificing Perigee Beckoner
4. Activate Ashnod's Altar 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. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana