Bhaal, Lord of Murder, and Hammerhead, Maggia Boss

Prerequisites

• Bhaal, Lord of Murder on the battlefield
• Hammerhead, Maggia Boss on the battlefield

Steps

1. Activate Hammerhead by sacrificing a persist creature that does not have a -1/-1 counter on it
2. When the creature dies, its persist ability and Bhaal trigger
3. Resolve the Bhaal trigger, putting a +1/+1 counter on the remaining persist creature
4. Resolve the sacrificed creature's persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it
5. Resolve the Hammerhead ability from step 1
6. Repeat

Results

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