Voltaic Construct + Faeburrow Elder + Neurok Transmuter

Voltaic Construct

Faeburrow Elder

Neurok Transmuter

How it works

1. Cause Faeburrow Elder to become an artifact using Neurok Transmuter.
2. Activate Faeburrow Elder by tapping it, adding at least 3
3. Activate Voltaic Construct by paying 2, untapping Faeburrow Elder.
4. Repeat from step 2.

This clever loop turns Faeburrow Elder into a self-contained mana engine by bridging the gap between its color-scaling tap ability and artifact synergy. Since the Elder naturally produces multiple mana of various colors, it easily pays the activation costs to keep the cycle going. Neurok Transmuter provides the crucial type-changing transformation that lets the creature qualify as an artifact creature, which in turn makes it a legal target for Voltaic Construct. Once the construct continually untaps the Elder, you are left with as much colored mana as you desire.