Junji, the Midnight Sky, Yahenni, Undying Partisan, Karmic Guide, and Syr Vondam, Sunstar Exemplar

Prerequisites

• Junji, the Midnight Sky on the battlefield
• Yahenni, Undying Partisan on the battlefield
• Karmic Guide on the battlefield
• Syr Vondam, Sunstar Exemplar on the battlefield

Steps

1. Activate Yahenni by sacrificing Karmic Guide
2. When Karmic Guide dies, Syr Vondam triggers, putting a +1/+1 counter on it and causing you to gain 1 life
3. Resolve the Yahenni ability
4. Activate Yahenni by sacrificing Junji
5. When Junji dies, it and Syr Vondam trigger
6. Resolve the Syr Vondam trigger, putting a +1/+1 counter on it and causing you to gain 1 life
7. Resolve the Junji trigger, returning Karmic Guide from your graveyard to the battlefield and causing you to lose 2 life
8. When Karmic Guide enters, it triggers, returning Junji from your graveyard to the battlefield
9. Resolve the Yahenni ability
10. Repeat

Results

• Infinite +1/+1 counters on a creature
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers