Kaya's Ghostform, Phyrexian Altar, and Eternal Witness

Prerequisites

• Kaya's Ghostform on the battlefield
• Phyrexian Altar on the battlefield
• Eternal Witness on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Eternal Witness, adding
2. When Eternal Witness dies, Kaya's Ghostform triggers, returning Eternal Witness from your graveyard to the battlefield
3. When Eternal Witness enters the battlefield, it triggers, returning Kaya's Ghostform from your graveyard to your hand
4. Cast Kaya's Ghostform by paying , attaching it to Eternal Witness
5. Repeat

Results

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