Su-Chi, Oathkeeper, Takeno's Daisho, Maskwood Nexus, and Phyrexian Altar

Prerequisites

• Su-Chi on the battlefield
• Oathkeeper, Takeno's Daisho on the battlefield
• Maskwood Nexus on the battlefield
• Phyrexian Altar on the battlefield
• Oathkeeper attached to Su-Chi

Steps

1. Activate Phyrexian Altar by sacrificing Su-Chi, adding one mana of any color
2. Su-Chi and Oathkeeper triggers
3. Resolve the Su-Chi trigger, adding
4. Resolve the Oathkeeper trigger, returning Su-Chi to the battlefield
5. Equip Oathkeeper to Su-Chi by paying
6. Repeat

Results

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