Kaya's Ghostform, Phyrexian Altar, and Dundoolin Weaver

Prerequisites

• Kaya's Ghostform on the battlefield
• Phyrexian Altar on the battlefield
• Dundoolin Weaver on the battlefield

Steps

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

Results

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