Mite Overseer + Ashnod's Altar + Stridehangar Automaton + Haliya, Guided by Light

Mite Overseer

Ashnod's Altar

Stridehangar Automaton

Haliya, Guided by Light

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 the battlefield, Haliya triggers twice, causing you to gain 2 life.
3. Activate Ashnod's Altar twice by sacrificing the Phyrexian Mite and Thopter, adding CCCC.
4. Repeat.

This loop relies on Stridehangar Automaton to turn a single token activation into a pair of artifacts, supercharging Mite Overseer's ability to pump out both a Phyrexian Mite and a bonus Thopter. As these tokens enter the battlefield, Haliya, Guided by Light chips in with a steady stream of lifegain triggers to pad your life total (and easily satisfying her end-step card draw condition). Finally, you feed those freshly made tokens into Ashnod's Altar, generating enough colorless mana to not only pay for the Overseer's activation again and again, but also yield a surplus of infinite mana along the way.