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

Prerequisites

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

Steps

1. Activate Phyrexian Altar by sacrificing Danitha, adding one mana of any color
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 colored mana
• Infinite sacrifice triggers
• Infinite death triggers