Havi, the All-Father, Sakashima of a Thousand Faces, and Phyrexian Altar

Prerequisites

• Havi, the All-Father on the battlefield
• Sakashima of a Thousand Faces on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Sakashima of a Thousand Faces, adding one mana of any color
2. When Sakashima of a Thousand Faces dies, it and Havi trigger
3. Resolve the Havi trigger, returning Sakashima of a Thousand Faces from your graveyard to the battlefield as a copy of Havi
4. Resolve the Sakashima of a Thousand Faces trigger, returning any legendary creature card with mana value 5 or less from your graveyard to the battlefield
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite colored mana
• Infinite sacrifice triggers
• Infinite death triggers
• Put all legendary creature cards with mana value 5 or less from your graveyard onto the battlefield