Traveling Plague, Altar of Dementia, and Archon of Sun's Grace

Prerequisites

• Traveling Plague in hand
• Altar of Dementia on the battlefield
• Archon of Sun's Grace on the battlefield
• available

Steps

1. Cast Traveling Plague by paying , attaching it to another creature you control
2. When Traveling Plague enters, Archon of Sun's Grace triggers, creating a creature token
3. Activate Altar of Dementia by sacrificing the creature Traveling Plague is attached to
4. When the creature dies, Traveling Plague triggers, returning itself from your graveyard to the battlefield attached to the token created in step 2
5. When Traveling Plague enters, Archon of Sun's Grace triggers, creating a creature token
6. Resolve the Altar of Dementia ability
7. Repeat from step 3

Results

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