Danitha, Benalia's Hope, Fungal Fortitude, and Phyrexian Altar

Prerequisites

• Danitha, Benalia's Hope on the battlefield
• Fungal Fortitude on the battlefield
• Phyrexian Altar on the battlefield

Steps

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

Results

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