Danitha, Benalia's Hope, Fool's Demise, and Altar of Dementia

Prerequisites

• Danitha, Benalia's Hope on the battlefield
• Fool's Demise on the battlefield
• Altar of Dementia on the battlefield
• Fool's Demise attached to Danitha

Steps

1. Activate Altar of Dementia by sacrificing Danitha
2. Danitha dies, triggering Fool's Demise's first and second abilities
3. Resolve the second Fool's Demise trigger, returning Fool's Demise from your graveyard to your hand
4. Resolve the first Fool's Demise trigger, returning Danitha from your graveyard to the battlefield
5. Danitha enters the battlefield, putting Gift of Immortality from your hand onto the battlefield attached to Danitha
6. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Danitha's power
7. Repeat

Results

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