Voltaic Construct + Empowered Autogenerator + Toymaker

Voltaic Construct

Empowered Autogenerator

Toymaker

How it works

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

This delightful loop turns the humble Empowered Autogenerator into a self-contained mana engine by using Toymaker to temporarily animate it into an artifact creature. Once it's a creature, Voltaic Construct can step in to untap it for a modest fee of two mana. Because Empowered Autogenerator scales its mana production higher with each accumulated charge counter, it quickly generates a surplus that pays for the untap cost while leaving an ever-growing pile of infinite colored mana in your pool.