Danitha, Benalia's Hope, Ashnod's Altar, and Unhallowed Pact

Prerequisites

• Danitha, Benalia's Hope on the battlefield
• Ashnod's Altar on the battlefield
• Unhallowed Pact on the battlefield
• Unhallowed Pact attached to Danitha

Steps

1. Activate Ashnod's Altar by sacrificing Danitha, adding
2. When Danitha dies, Unhallowed Pact triggers, returning Danitha from your graveyard to the battlefield tapped
3. When Danitha enters the battlefield, it triggers, returning Unhallowed Pact 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