Brotherhood Outcast, Carrion Feeder, and Unhallowed Pact

Prerequisites

• Brotherhood Outcast on the battlefield
• Carrion Feeder on the battlefield
• Unhallowed Pact on the battlefield

Steps

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

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on Carrion Feeder