Danitha, Benalia's Hope, Ashnod's Altar, and Unholy Indenture

Prerequisites

• Danitha, Benalia's Hope on the battlefield
• Ashnod's Altar on the battlefield
• Unholy Indenture on the battlefield
• Unholy Indenture attached to Danitha

Steps

1. Activate Ashnod's Altar by sacrificing Danitha, adding
2. When Danitha dies, Unholy Indenture triggers, returning Danitha from your graveyard to the battlefield tapped
3. When Danitha enters the battlefield, it triggers, returning Unholy Indenture from your graveyard to the battlefield attached to Danitha
4. Repeat

Results

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