Activate Mite Overseer by paying 3W/P, creating a 1/1 Thopter and a 1/1 Phyrexian Mite artifact creature token.
When the Phyrexian Mite and Thopter enter, Lunarch Veteran triggers twice if it's on the battlefield, causing you to gain 2 life
Activate Krark-Clan Ironworks twice by sacrificing the Phyrexian Mite and Thopter, adding CCCC.
When the Phyrexian Mite and Thopter die, Luminous Phantom triggers twice if it's on the battlefield, causing you to gain 2 life.
Repeat.
This clever loop uses Krark-Clan Ironworks as your engine, turning the cost of activation into a profit thanks to Stridehangar Automaton, which juices up your token generation by spawning an extra Thopter alongside every Phyrexian Mite created. You feed those artifacts right back into the Ironworks for more than enough mana to fuel Mite Overseer's hybrid-cost activation repeatedly. Meanwhile, Lunarch Veteran—whether on its front face or transformed as Luminous Phantom—watches the creatures endlessly enter and leave the battlefield, turning the churn into an unstoppable stream of life.