Voltaic Construct + Biotransference + Karametra's Acolyte

Voltaic Construct

Biotransference

Karametra's Acolyte

How it works

1. Activate Karametra's Acolyte by tapping it, adding at least .
2. Activate Voltaic Construct by paying 2, untapping Karametra's Acolyte.
3. Repeat

This combination turns your green mana production into a self-sustaining loop by leveraging Biotransference, which makes Karametra's Acolyte an artifact creature in addition to its other types. Because the Acolyte is now an artifact creature, it becomes a legal target for Voltaic Construct's untap ability. As long as your green devotion is high enough to generate more than the two mana required to activate Voltaic Construct, you can endlessly untap Karametra's Acolyte to produce infinite green mana and infinite untaps.