Brotherhood Outcast, Yahenni, Undying Partisan, and Changing Loyalty

Prerequisites

• Brotherhood Outcast on the battlefield
• Yahenni, Undying Partisan on the battlefield
• Changing Loyalty on the battlefield

Steps

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

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite creature sacrifice triggers