Saffi Eriksdotter, Phyrexian Altar, Muldrotha, the Gravetide, and Pitiless Plunderer

Prerequisites

• Saffi Eriksdotter on the battlefield
• Phyrexian Altar on the battlefield
• Muldrotha, the Gravetide on the battlefield
• Pitiless Plunderer on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Muldrotha
2. Saffi dies, triggering Pitiless Plunderer, creating a Treasure token
3. Resolve the Saffi ability
4. Activate Phyrexian Altar by sacrificing Muldrotha, adding
5. When Muldrotha dies, Saffi and Pitiless Plunderer trigger
6. Resolve the Pitiless Plunderer trigger, creating a Treasure token
7. Resolve the Saffi trigger, returning Muldrotha from your graveyard to the battlefield
8. Activate a Treasure by tapping and sacrificing it, adding
9. Cast Saffi from your graveyard by paying
10. Repeat

Results

• Infinite colored mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count
• Infinite Treasure tokens