Melira, Sylvok Outcast, Puppeteer Clique, and Yahenni, Undying Partisan

Prerequisites

• Melira, Sylvok Outcast on the battlefield
• Puppeteer Clique on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Yahenni by sacrificing Puppeteer Clique
2. When Puppeteer Clique dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Melira
3. When Puppeteer Clique enters, it triggers, putting a creature from an opponent's graveyard onto the battlefield under your control
4. Resolve the Yahenni 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 sacrifice triggers