Loyal Retainers, Karmic Guide, Moritte of the Frost, and Yahenni, Undying Partisan

Prerequisites

• Loyal Retainers on the battlefield
• Karmic Guide on the battlefield
• Moritte of the Frost in the graveyard
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Loyal Retainers by sacrificing it, returning Moritte of the Frost from your graveyard to the battlefield as a copy of Karmic Guide
2. When Moritte of the Frost enters the battlefield, it triggers, returning Loyal Retainers from your graveyard to the battlefield
3. Activate Yahenni by sacrificing Moritte of the Frost
4. Repeat

Results

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