By using Myr Welder to absorb Chromatic Orrery in exile, our tiny construct gains the magnificent ability to tap for five colorless mana. Equipping Sword of the Paruns provides the crucial mechanical bridge, allowing us to spend three of that newly generated mana to instantly untap Myr Welder. This creates a self-sustaining mana loop that not only yields infinite colorless mana, but also lets us abuse Chromatic Orrery's color-fixing and card-drawing abilities to burn through our entire deck.