Mite Overseer + Krark-Clan Ironworks + Trostani, Selesnya's Voice + Stridehangar Automaton

Mite Overseer

Krark-Clan Ironworks

Trostani, Selesnya's Voice

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, Trostani 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.

This engine is brilliantly fueled by Krark-Clan Ironworks, which lets you sacrifice the token output generated by Mite Overseer to refund more than enough colorless mana to keep the loop going. Meanwhile, Stridehangar Automaton serves as a powerful multiplier, piggybacking off every Phyrexian Mite created to drop an extra Thopter into play alongside it. As your mechanical army endlessly floods the battlefield, Trostani, Selesnya's Voice watches over the assembly line and converts every single entry into a steady stream of life.