Xu-Ifit, Osteoharmonist, Thornbite Staff, and Phyrexian Altar

Prerequisites

• Xu-Ifit, Osteoharmonist on the battlefield
• Thornbite Staff on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Xu-Ifit by tapping it, returning a creature card from your graveyard to the battlefield
2. Activate Phyrexian Altar by sacrificing the creature returned in step 1
3. When the creature dies, Xu-Ifit triggers, untapping itself
4. Repeat

Results

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