Sigil of the New Dawn, Lion's Eye Diamond, March of the Machines, and The Immortal Sun

Prerequisites

• Sigil of the New Dawn on the battlefield
• Lion's Eye Diamond in hand
• March of the Machines on the battlefield
• The Immortal Sun on the battlefield

Steps

1. Cast Lion's Eye Diamond by paying ; it enters the battlefield as a 1/1 artifact creature
2. Activate Lion's Eye Diamond by sacrificing it and discarding your hand, adding
3. Sigil of the New Dawn triggers, causing you to pay to return Lion's Eye Diamond from the graveyard to your hand
4. Repeat any number of times
5. Once you have infinite white mana, you may repeat the loop adding any color of mana in step 2

Results

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