Sigil of the New Dawn, Pitiless Plunderer, Ashnod's Altar, and Ornithopter

Prerequisites

• Sigil of the New Dawn on the battlefield
• Pitiless Plunderer on the battlefield
• Ashnod's Altar on the battlefield
• Ornithopter on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Ornithopter, adding
2. When Ornithopter 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 Ornithopter to your hand from your graveyard
6. Cast Ornithopter by paying
7. Repeat

Results

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