Prerequisites
- Emptiness in hand
- Phyrexian Altar on the battlefield
- Eternal Witness in the graveyard
- available 
Steps
- Cast Emptiness for its evoke cost by paying 
- When Emptiness enters, its first ability and evoke ability trigger
- Holding priority, activate Phyrexian Altar by sacrificing Emptiness, adding 
- Resolve Emptiness's evoke trigger, failing to sacrifice it as it's no longer on the battlefield
- Resolve Emptiness's first trigger, returning Eternal Witness from your graveyard to the battlefield
- When Eternal Witness enters, it triggers, returning Emptiness from your graveyard to your hand
- Activate Phyrexian Altar by sacrificing Eternal Witness, adding 
- Repeat
Results
Required Cards 3
 - Emptiness- Creature — Elemental Incarnation 
 - Phyrexian Altar- Artifact 
 - Eternal Witness- Creature — Human Shaman 
 
 
 
