Gorma, the Gullet, and Yahenni, Undying Partisan

Prerequisites

• Gorma, the Gullet on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Yahenni 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. Resolve the Yahenni ability
6. Repeat

Results

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