Stalwart Successor, Puppeteer Clique, and Altar of Dementia

Prerequisites

• Stalwart Successor on the battlefield
• Puppeteer Clique on the battlefield
• Altar of Dementia on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing Puppeteer Clique When Puppeteer Clique dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
2. When Puppeteer Clique enters, it and Stalwart Successor trigger
3. Resolve the Puppeteer Clique trigger, putting a creature from an opponent's graveyard onto the battlefield under your control
4. Resolve the Stalwart Successor trigger, putting a +1/+1 counter on Puppeteer Clique Resolve the Altar of Dementia ability
5. Repeat

Results

• Put all creature cards from each opponent's graveyard onto the battlefield under your control
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill