Saffi Eriksdotter, Yahenni, Undying Partisan, and Karmic Guide

Prerequisites

• Saffi Eriksdotter on the battlefield
• Yahenni, Undying Partisan on the battlefield
• Karmic Guide in hand

Steps

1. Activate Saffi by sacrificing it, targeting Karmic Guide Activate Yahenni by sacrificing Karmic Guide When Karmic Guide dies, Saffi triggers, returning Karmic Guide from your graveyard to the battlefield
2. When Karmic Guide enters, it triggers, returning Saffi from your graveyard to the battlefield
3. Resolve the Yahenni ability
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite death triggers