Sigil of the New Dawn, Blessed Sanctuary, Phyrexian Altar, and Ornithopter

Prerequisites

• Sigil of the New Dawn on the battlefield
• Blessed Sanctuary on the battlefield
• Phyrexian Altar on the battlefield
• Ornithopter on the battlefield
• available

Steps

1. Activate Phyrexian Altar by sacrificing Ornithopter, adding
2. When Ornithopter dies, Sigil of the New Dawn triggers, causing you to pay to return Ornithopter to your hand from your graveyard
3. Cast Ornithopter by paying
4. When Ornithopter enters the battlefield, Blessed Sanctuary triggers, creating a 2/2 Unicorn creature token
5. Activate Phyrexian Altar by sacrificing the Unicorn, adding
6. Repeat

Results

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