Relentless Dead, Rooftop Storm, and Phyrexian Altar

Prerequisites

• Relentless Dead on the battlefield
• Rooftop Storm on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Relentless Dead, adding
2. Relentless Dead's first and second abilities trigger
3. Resolve Relentless Dead's first ability, causing you to pay to return Relentless Dead from your graveyard to your hand
4. Resolve Relentless Dead's second abilitiy, choosing not to pay
5. Cast Relentless Dead by paying
6. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count