Sidisi, Regent of the Mire, Karmic Guide, Yahenni, Undying Partisan, and Breaching Hippocamp

Prerequisites

• Sidisi, Regent of the Mire on the battlefield
• Karmic Guide in the graveyard
• Yahenni, Undying Partisan on the battlefield
• Breaching Hippocamp on the battlefield

Steps

1. Activate Sidisi by tapping it and sacrificing Breaching Hippocamp, returning Karmic Guide from your graveyard to the battlefield
2. When Karmic Guide enters the battlefield, it triggers, returning Breaching Hippocamp from your graveyard to the battlefield
3. When Breaching Hippocamp enters the battlefield, it triggers, untapping Sidisi
4. Activate Yahenni by sacrificing Karmic Guide
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers