Mite Overseer + Krark-Clan Ironworks + Essence Warden + Stridehangar Automaton

Mite Overseer

Krark-Clan Ironworks

Essence Warden

Stridehangar Automaton

How it works

1. Activate Mite Overseer by paying 3W/P, creating a 1/1 Thopter and a 1/1 Phyrexian Mite artifact creature token.
2. When the Phyrexian Mite and Thopter enter, Essence Warden triggers twice, causing you to gain 2 life
3. Activate Krark-Clan Ironworks twice by sacrificing the Phyrexian Mite and Thopter, adding CCCC.
4. Repeat.

By leaning on the token-doubling replacement effect of Stridehangar Automaton, every activation of Mite Overseer yields both a Phyrexian Mite and an extra Thopter for a bargain price, which can even be offset using life instead of white mana. You then feed those newly minted artifacts straight into Krark-Clan Ironworks to generate a surplus of colorless mana, turning the initial investment into a net gain. Meanwhile, Essence Warden stands by to convert the endless parade of arriving creatures into an unceasing stream of life, fueling an infinite loop of creation and sacrifice.