Emptiness, Phyrexian Altar, and Skullwinder

Prerequisites

• Emptiness in hand
• Phyrexian Altar on the battlefield
• Skullwinder in the graveyard
• available

Steps

1. Cast Emptiness for its evoke cost by paying
2. When Emptiness enters, its first ability and evoke ability trigger
3. Holding priority, activate Phyrexian Altar by sacrificing Emptiness, adding
4. Resolve Emptiness's evoke trigger, failing to sacrifice it as it's no longer on the battlefield
5. Resolve Emptiness's first trigger, returning Skullwinder from your graveyard to the battlefield
6. When Skullwinder enters, it triggers, returning Emptiness from your graveyard to your hand
7. Activate Phyrexian Altar by sacrificing Skullwinder, adding
8. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite storm count
• Target opponent returns all cards in their graveyard to their hand