Voltaic Construct + Encroaching Mycosynth + Incubation Druid

Voltaic Construct

Encroaching Mycosynth

Incubation Druid

How it works

1. Activate Incubation Druid by tapping it, adding three mana of any type a land you control can produce
2. Activate Voltaic Construct by paying 2, untapping Incubation Druid.
3. Repeat

The magic here truly begins with Encroaching Mycosynth, which turns Incubation Druid into an artifact creature alongside its natural druid type, rendering it a valid target for Voltaic Construct. Once the Druid is tapped for three mana thanks to its +1/+1 counters, you simply feed two of that mana into the Construct to untap the Druid, netting a profit of one mana each cycle. Because Encroaching Mycosynth folds every nonland permanent into the artifact family, this loop is self-contained, effortlessly generating infinite mana of any type your lands can produce while also granting you infinite untaps of your artifact creatures.