Sigil of the New Dawn, Mana Echoes, Siege-Gang Commander, and Gemstone Array

Prerequisites

• Sigil of the New Dawn on the battlefield
• Mana Echoes on the battlefield
• Siege-Gang Commander in hand
• Gemstone Array on the battlefield
• available

Steps

1. Cast Siege-Gang Commander by paying
2. When Siege-Gang Commander enters the battlefield, it and Mana Echoes trigger
3. Resolve the Siege-Gang Commander trigger, creating three 1/1 Goblin creature tokens
4. When the Goblin tokens enter the battlefield, Mana Echoes triggers three times
5. Resolve all four Mana Echoes triggers, adding at least
6. Activate Gemstone Array four times by paying , adding
7. Activate Siege-Gang Commander by paying and sacrificing itself
8. Sigil of the New Dawn triggers, causing you to pay to return Siege-Gang Commander from your graveyard to your hand
9. Resolve the Siege-Gang Commander activated ability, dealing 2 damage to any target
10. Repeat

Results

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