Saffi Eriksdotter, Extraction Specialist, and Altar of Dementia

Prerequisites

• Saffi Eriksdotter on the battlefield
• Extraction Specialist on the battlefield
• Altar of Dementia on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Extraction Specialist
2. Activate Altar of Dementia by sacrificing Extraction Specialist
3. When Extraction Specialist dies, Saffi triggers, returning Extraction Specialist from your graveyard to the battlefield
4. When Extraction Specialist 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 Extraction Specialist's power
6. Repeat

Results

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