Kaya's Ghostform, Phyrexian Altar, and Elvish Regrower

Prerequisites

• Kaya's Ghostform on the battlefield
• Phyrexian Altar on the battlefield
• Elvish Regrower on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Elvish Regrower, adding
2. When Elvish Regrower dies, Kaya's Ghostform triggers, returning Elvish Regrower from your graveyard to the battlefield
3. When Elvish Regrower 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 Elvish Regrower
5. Repeat

Results

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