Voltaic Construct + Empowered Autogenerator + Bello, Bard of the Brambles

Voltaic Construct

Empowered Autogenerator

Bello, Bard of the Brambles

How it works

1. Activate Empowered Autogenerator by tapping it, putting a charge counter on it and adding 1 for each charge counter on it.
2. Activate Voltaic Construct by paying 2, untapping Empowered Autogenerator.
3. Repeat

This loop turns your artifacts into a self-sustaining mana engine by leaning on Bello, Bard of the Brambles to give Empowered Autogenerator the artifact creature type it needs to be targeted. Once animated, Empowered Autogenerator taps to produce an escalating amount of mana based on its growing stack of charge counters. You then funnel a portion of that mana into Voltaic Construct to untap it, leaving you with a net positive of mana and a rising counter count to repeat the cycle infinitely.