Stalwart Successor, Woodfall Primus, and Altar of Dementia

Prerequisites

• Stalwart Successor on the battlefield
• Woodfall Primus on the battlefield
• Altar of Dementia on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing Woodfall Primus When Woodfall Primus dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
2. When Woodfall Primus enters, it and Stalwart Successor trigger
3. Resolve the Woodfall Primus trigger, destroying a noncreature permanent
4. Resolve the Stalwart Successor trigger, putting a +1/+1 counter on Woodfall Primus Resolve the Altar of Dementia ability
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill
• Destroy any number of noncreature permanents
• Lock