Aurelia, the Warleader, Seluma, Light of Aysen, and Altar of Dementia

Prerequisites

• Aurelia, the Warleader on the battlefield
• Seluma, Light of Aysen on the battlefield
• Altar of Dementia on the battlefield

Steps

1. Declare Aurelia and Seluma as attackers
2. Aurelia triggers, causing you to untap all creatures you control and to get an additional combat phase after this one
3. Activate Altar of Dementia by sacrificing Aurelia
4. Deal combat damage using Seluma
5. Seluma triggers, returning Aurelia from your graveyard to the battlefield
6. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite combat damage
• Infinite combat phases
• Infinite death triggers
• Infinite mana creatures you control can produce
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill
• Infinite untap of creatures you control