Saffi Eriksdotter, Karmic Guide, and Altar of Dementia

Prerequisites

• Saffi Eriksdotter on the battlefield
• Karmic Guide on the battlefield
• Altar of Dementia on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Karmic Guide
2. Activate Altar of Dementia by sacrificing Karmic Guide
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. Resolve the Altar of Dementia ability from step 2, causing target player to mill cards equal to Karmic Guide's power
6. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill