Voltaic Construct + Liquimetal Torque + Incubation Druid

Voltaic Construct

Liquimetal Torque

Incubation Druid

How it works

1. Cause Incubation Druid to become an artifact using Liquimetal Torque.
2. Activate Incubation Druid by tapping it, adding three mana of any type a land you control can produce
3. Activate Voltaic Construct by paying 2, untapping Incubation Druid.
4. Repeat from step 2.

This clever loop turns an ordinary mana dork into an engine by using Liquimetal Torque to temporarily turn Incubation Druid into an artifact. Once the Druid is an artifact, it can produce triple mana thanks to a +1/+1 counter, giving you more than enough resources to fund Voltaic Construct's untap ability. By repeatedly untapping the newly minted artifact creature, you generate infinite mana of any type your lands can produce.