Danitha, Benalia's Hope, Kaya's Ghostform, and Ashnod's Altar

Prerequisites

• Danitha, Benalia's Hope on the battlefield
• Kaya's Ghostform on the battlefield
• Ashnod's Altar on the battlefield
• Kaya's Ghostform attached to Danitha

Steps

1. Activate Ashnod's Altar by sacrificing Danitha, adding
2. Danitha dies, triggering Kaya's Ghostform, returning Danitha from your graveyard to the battlefield
3. Danitha enters the battlefield, returning Kaya's Ghostform from your graveyard to the battlefield attached to Danitha
4. Repeat

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers