Junji, the Midnight Sky, Phyrexian Altar, Cruel Celebrant, and Metamorphosis Fanatic

Prerequisites

• Junji, the Midnight Sky on the battlefield
• Phyrexian Altar on the battlefield
• Cruel Celebrant on the battlefield
• Metamorphosis Fanatic on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Metamorphosis Fanatic
2. When Metamorphosis Fanatic dies, Cruel Celebrant triggers, causing you to gain 1 life and each opponent to lose 1 life
3. Activate Phyrexian Altar by sacrificing Junji
4. When Junji dies, it and Cruel Celebrant trigger
5. Resolve the Cruel Celebrant trigger, causing you to gain 1 life and each opponent to lose 1 life
6. Resolve the Junji trigger, returning Metamorphosis Fanatic from your graveyard to the battlefield and causing you to lose 2 life
7. When Metamorphosis Fanatic enters, it triggers, returning Junji from your graveyard to the battlefield
8. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite colored mana
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite lifeloss