Brotherhood Outcast, Phyrexian Altar, and Fungal Fortitude

Prerequisites

• Brotherhood Outcast on the battlefield
• Phyrexian Altar on the battlefield
• Fungal Fortitude on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Brotherhood Outcast
2. When Brotherhood Outcast dies, Fungal Fortitude triggers, returning Brotherhood Outcast from your graveyard to the battlefield
3. When Brotherhood Outcast enters the battlefield, it triggers, returning Fungal Fortitude from your graveyard to the battlefield attached to Brotherhood Outcast
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite colored mana
• Infinite sacrifice triggers
• Infinite death triggers