This clever loop transforms Metalworker into an absolute mana-printing powerhouse, as long as you've got a couple of artifacts tucked safely in your hand to reveal for its massive {C}{C} per card mana production. To keep the engine running, Pemmin's Aura is enchanted onto Metalworker, providing a cheap untap ability that feeds directly on the generated energy. Meanwhile, Crossroads Candleguide quietly sits on the board, acting as an essential color fixer that converts your floating colorless resources into the exact blue mana needed to activate Pemmin's Aura's untap ability.