Perigee Beckoner, Ashnod's Altar, and Karmic Guide

Prerequisites

• Perigee Beckoner in hand
• Ashnod's Altar on the battlefield
• Karmic Guide on the battlefield

Steps

1. Cast Perigee Beckoner for its warp cost by paying
2. When Perigee Beckoner enters, it triggers, targeting Karmic Guide
3. Activate Ashnod's Altar by sacrificing Perigee Beckoner
4. Activate Ashnod's Altar by sacrificing Karmic Guide
5. When Karmic Guide dies, it triggers, returning itself from your graveyard to the battlefield tapped
6. When Karmic Guide enters, it triggers, returning Perigee Beckoner from your graveyard to the battlefield
7. When Perigee Beckoner enters, it triggers, targeting Karmic Guide
8. Repeat from step 3

Results

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