Voltaic Construct + Encroaching Mycosynth + Topiary Lecturer

Voltaic Construct

Encroaching Mycosynth

Topiary Lecturer

How it works

1. Activate Topiary Lecturer by tapping it, adding at least
2. Activate Voltaic Construct by paying 2, untapping Topiary Lecturer.
3. Repeat

This engine takes off thanks to Encroaching Mycosynth, which turns Topiary Lecturer into an artifact creature alongside its other types, allowing it to be targeted by Voltaic Construct. Once you tap Topiary Lecturer to add green mana, you simply channel a portion of that energy into Voltaic Construct's activation cost to untap the Lecturer. Because the mana produced outpaces the cost of the untap loop, you can repeat this process as many times as you like to generate infinite green mana and infinite untaps.