Saffi Eriksdotter, Eternal Witness, Aluren, and Altar of Dementia

Prerequisites

• Saffi Eriksdotter on the battlefield
• Eternal Witness on the battlefield
• Aluren on the battlefield
• Altar of Dementia on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Eternal Witness
2. Activate Altar of Dementia by sacrificing Eternal Witness
3. When Eternal Witness dies, Saffi triggers, returning it from your graveyard to the battlefield
4. When Eternal Witness enters the battlefield, it triggers, returning Saffi from your graveyard to your hand
5. Resolve the Altar of Dementia ability from step 2, causing target player to mill cards equal to Eternal Witness's power
6. Cast Saffi by paying due to Aluren
7. Repeat

Results

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