Danitha, Benalia's Hope, Yahenni, Undying Partisan, and Unhallowed Pact

Prerequisites

• Danitha, Benalia's Hope on the battlefield
• Yahenni, Undying Partisan on the battlefield
• Unhallowed Pact on the battlefield
• Unhallowed Pact attached to Danitha

Steps

1. Activate Yahenni by sacrificing Danitha
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. Resolve the Yahenni ability
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers