Sigil of the New Dawn, Pitiless Plunderer, Phyrexian Altar, and Memnite

Prerequisites

• Sigil of the New Dawn on the battlefield
• Pitiless Plunderer on the battlefield
• Phyrexian Altar on the battlefield
• Memnite on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Memnite, adding
2. When Memnite dies, Sigil of the New Dawn and Pitiless Plunderer trigger
3. Resolve the Pitiless Plunderer trigger, creating a Treasure token
4. Activate the Treasure by tapping and sacrificing it, adding
5. Resolve the Sigil of the New Dawn trigger, causing you to pay to return Memnite to your hand from your graveyard
6. Cast Memnite by paying
7. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count