Phyrexian Altar, and Gorma, the Gullet

Prerequisites

• Phyrexian Altar on the battlefield
• Gorma, the Gullet on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing the persist creature
2. When the persist creature dies, its persist ability and Gorma trigger
3. Resolve the Gorma trigger, putting a +1/+1 counter on it
4. Resolve the persist trigger, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Gorma
5. Repeat

Results

• Infinite +1/+1 counters on a creature
• Infinite ETB
• Infinite LTB
• Infinite colored mana
• Infinite death triggers
• Infinite sacrifice triggers