Saffi Eriksdotter, Karmic Guide, and Ashnod's Altar

Prerequisites

• Saffi Eriksdotter on the battlefield
• Karmic Guide on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Karmic Guide
2. Activate Ashnod's Altar by sacrificing Karmic Guide, adding
3. Karmic Guide dies, triggering Saffi, returning Karmic Guide from your graveyard to the battlefield
4. When Karmic Guide enters the battlefield, it triggers, returning Saffi from your graveyard to the battlefield
5. Repeat

Results

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