Sigil of the New Dawn, Phyrexian Altar, Cathodion, and Semblance Anvil

Prerequisites

• Sigil of the New Dawn on the battlefield
• Phyrexian Altar on the battlefield
• Cathodion on the battlefield
• Semblance Anvil on the battlefield
• Any artifact or creature exiled by Semblance Anvil

Steps

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

Results

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