Jackdaw Savior, Loyal Retainers, and Phyrexian Altar

Prerequisites

• Jackdaw Savior on the battlefield
• Loyal Retainers in the graveyard
• Phyrexian Altar on the battlefield

Steps

1. During your precombat main phase, activate Phyrexian Altar by sacrificing the legendary creature with flying, adding one mana of any color
2. When the creature dies, Jackdaw Savior triggers, returning Loyal Retainers from your graveyard to the battlefield
3. Activate Loyal Retainers by sacrificing it, returning the legendary creature with flying from your graveyard to the battlefield
4. Repeat

Results

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