Sigil of the New Dawn, Phyrexian Altar, Priest of Gix, and Urza's Incubator

Prerequisites

• Sigil of the New Dawn on the battlefield
• Phyrexian Altar on the battlefield
• Priest of Gix in hand
• Urza's Incubator on the battlefield
• "Cleric" chosen with Urza's Incubator
• available

Steps

1. Cast Priest of Gix by paying
2. Priest of Gix enters the battlefield, adding
3. Activate Phyrexian Altar by sacrificing Priest of Gix, adding
4. Sigil of the New Dawn triggers, causing you to pay , returning Priest of Gix to hand
5. Repeat

Results

• Infinite black mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers