Myr Welder + Encroaching Mycosynth + Empowered Autogenerator + Merrow Wavebreakers

Myr Welder

Encroaching Mycosynth

Empowered Autogenerator

Merrow Wavebreakers

How it works

1. Activate Myr Welder using Empowered Autogenerator's ability by tapping it, putting a charge counter on Myr Welder and adding for each charge counter on Myr Welder.
2. Activate Myr Welder using Merrow Wavebreakers's ability by paying 1 and untapping it, giving it flying until end of turn.
3. Repeat.

This engine gets its power by turning Myr Welder into a self-sustaining mana and counter factory, quietly enabled by Encroaching Mycosynth ensuring everything you own is an artifact waiting to be exploited. Once Empowered Autogenerator and Merrow Wavebreakers are safely resting in your graveyard for Myr Welder to imprint, the Welder gains both the ability to tap and grow its own charge counters while generating massive colored mana, and the untap capability fueled by Merrow Wavebreakers. By looping these activated abilities back and forth, you net infinite mana of any color alongside infinite charge counters on your permanents.