Melira, Sylvok Outcast, Puppeteer Clique, and Phyrexian Altar

Prerequisites

• Melira, Sylvok Outcast on the battlefield
• Puppeteer Clique on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Phyrexian Altar 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. Repeat

Results

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