Danitha, Benalia's Hope, Gift of Immortality, and Altar of Dementia

Prerequisites

• Danitha, Benalia's Hope on the battlefield
• Gift of Immortality on the battlefield
• Altar of Dementia on the battlefield
• Gift of Immortality attached to Danitha

Steps

1. Activate Altar of Dementia by sacrificing Danitha
2. Danitha dies, triggering Gift of Immortality, returning Danitha from your graveyard to the battlefield
3. Danitha enters the battlefield, returning Gift of Immortality from your graveyard to the battlefield attached to Danitha
4. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Danitha's power
5. Repeat

Results

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