Sigil of the New Dawn, Phyrexian Altar, Su-Chi, and Urza's Incubator

Prerequisites

• Sigil of the New Dawn on the battlefield
• Phyrexian Altar on the battlefield
• Su-Chi on the battlefield
• Urza's Incubator on the battlefield
• "Construct" chosen with Urza's Incubator

Steps

1. Activate Phyrexian Altar by sacrificing Su-Chi, adding
2. Su-Chi dies, triggering itself and Sigil of New Dawn
3. Resolve the Su-Chi trigger, adding
4. Resolve the Sigil of New Dawn trigger, causing you to pay to return Su-Chi from your graveyard to your hand
5. Cast Su-Chi by paying
6. Repeat

Results

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