Saffi Eriksdotter, Phyrexian Altar, and Karmic Guide

Prerequisites

• Saffi Eriksdotter on the battlefield
• Phyrexian Altar on the battlefield
• Karmic Guide in hand

Steps

1. Activate Saffi by sacrificing it, targeting Karmic Guide Activate Phyrexian Altar 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. Repeat

Results

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