Brotherhood Outcast, Unholy Indenture, and Hammerhead, Maggia Boss

Prerequisites

• Brotherhood Outcast on the battlefield
• Unholy Indenture on the battlefield
• Hammerhead, Maggia Boss on the battlefield

Steps

1. Activate Hammerhead by sacrificing Brotherhood Outcast
2. When Brotherhood Outcast dies, Unholy Indenture triggers, returning Brotherhood Outcast from your graveyard to the battlefield
3. When Brotherhood Outcast enters the battlefield, it triggers, returning Unholy Indenture from your graveyard to the battlefield attached to Brotherhood Outcast
4. Resolve the Hammerhead ability
5. Repeat

Results

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