Altar of Dementia, Thran Vigil, and Rendclaw Trow

Prerequisites

• Altar of Dementia on the battlefield
• Thran Vigil on the battlefield
• Rendclaw Trow on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing Rendclaw Trow
2. When Rendclaw Trow dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. Thran Vigil triggers, putting a +1/+1 counter on Rendclaw Trow
4. Resolve the Altar of Dementia ability
5. Repeat

Results

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