Danitha, Benalia's Hope, Phyrexian Altar, and Necrogen Communion

Prerequisites

• Danitha, Benalia's Hope on the battlefield
• Phyrexian Altar on the battlefield
• Necrogen Communion on the battlefield
• Necrogen Communion attached to Danitha

Steps

1. Activate Phyrexian Altar by sacrificing Danitha, adding one mana of any color
2. When Danitha dies, Necrogen Communion triggers, returning Danitha from your graveyard to the battlefield tapped
3. When Danitha enters the battlefield, it triggers, returning Necrogen Communion 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