Brotherhood Outcast, Shilgengar, Sire of Famine, and Unhallowed Pact

Prerequisites

• Brotherhood Outcast on the battlefield
• Shilgengar, Sire of Famine on the battlefield
• Unhallowed Pact on the battlefield

Steps

1. Activate Shilgengar 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 Shilgengar ability
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite Blood tokens