Voltaic Construct + Llanowar Tribe + Thran Forge

Voltaic Construct

Llanowar Tribe

Thran Forge

How it works

1. Cause Llanowar Tribe to become an artifact using Thran Forge.
2. Activate Llanowar Tribe by tapping it, adding
3. Activate Voltaic Construct by paying 2, untapping Llanowar Tribe.
4. Repeat from step 2.

By applying Thran Forge's activation to Llanowar Tribe, you cleverly transform the classic green mana dork into an artifact creature. This crucial type change makes it a legal target for Voltaic Construct, whose ability uses two of the three green mana generated by tapping Llanowar Tribe to untap it right back. You are left with a net gain of one green mana per iteration, allowing you to cycle the loop indefinitely for an endless supply of green mana and infinite untaps.