Voltaic Construct + Thran Forge + Rofellos, Llanowar Emissary

Voltaic Construct

Thran Forge

Rofellos, Llanowar Emissary

How it works

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

This clever three-card loop transforms a legendary elf druid into a self-contained mana engine. By using Thran Forge to turn Rofellos, Llanowar Emissary into an artifact creature, it becomes a valid target for Voltaic Construct's untap ability. Once Rofellos is sufficiently backed by Forests to produce more than two green mana per tap, you can easily fuel the Construct's activation cost and generate an infinite surplus of green mana.