This engine gets its explosive power by weaponizing the token-doubling replacement effect of Mondrak, Glory Dominus to turn Urza, Prince of Kroog's copy ability into a self-sustaining manufacturing line. With six mana channeled from Basalt Monolith, Urza copies the Monolith; thanks to Mondrak, you get two copies instead of one, which together tap for six mana to fund the next loop and generate an ever-growing army of 1/1 Soldier artifact creatures. Meanwhile, Urza's static buff pumps your entire mechanical legion, and Akroma's Memorial grants that massive token swarm a devastating array of keywords like flying, haste, and trample to swing for the win immediately.