MTG >Combos >Rings of Brighthearth +Voltaic Key +Empowered Autogenerator +

With

Rings of Brighthearth

,

Voltaic Key

and

Empowered Autogenerator

on the battlefield. 1-

Empowered Autogenerator

put a charge counter on it and generate one mana of any color, pay untap it with the

Voltaic Key

2- with the ability on the stack copy that untapping

Voltaic Key

itself 3-

Empowered Autogenerator

put a charge counter on it and generate two mana of any color, pay untap it with the

Voltaic Key

copy again with each loop you increase the mana generation of

Empowered Autogenerator

by one. From 3 mana generation you have infinite mana.