Renegade Rallier, Saffi Eriksdotter, and Phyrexian Altar

Prerequisites

• Renegade Rallier on the battlefield
• Saffi Eriksdotter on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Renegade Rallier
2. Activate Phyrexian Altar by sacrificing Renegade Rallier, adding one mana of any color
3. When Renegade Rallier dies, Saffi triggers, returning Renegade Rallier from your graveyard to the battlefield
4. When Renegade Rallier enters the battlefield, it triggers, returning Saffi from your graveyard to the battlefield
5. Repeat

Results

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