Phyrexian Altar, and Arwen, Weaver of Hope

Prerequisites

• Phyrexian Altar on the battlefield
• Arwen, Weaver of Hope on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing the persist creature
2. When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Arwen
3. Repeat

Results

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