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 the battlefield, Haliya triggers twice, causing you to gain 2 life.
Activate Krark-Clan Ironworks twice by sacrificing the Phyrexian Mite and Thopter, adding CCCC.
Repeat.
This looping engine relies on Krark-Clan Ironworks to convert the artifacts you generate into a steady stream of colorless mana, fueling the activation cost for Mite Overseer. Thanks to Stridehangar Automaton's replacement effect, every time you activate the Overseer, you get both a Phyrexian Mite and an extra Thopter token to sacrifice. Meanwhile, Haliya, Guided by Light gracefully tracks all this frantic assembly, turning every entry into a steady stream of lifegain triggers to pad your life total.