Voltaic Construct + Liquimetal Coating + Rofellos, Llanowar Emissary

Voltaic Construct

Liquimetal Coating

Rofellos, Llanowar Emissary

How it works

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

This charming loop transforms Rofellos, Llanowar Emissary into an artifact creature with the help of Liquimetal Coating, opening the door for Voltaic Construct to repeatedly untap him. As long as you control at least three Forests, tapping Rofellos yields more than enough green mana to pay for the Construct's untap cost while leaving a tidy profit behind. The result is an engine that generates infinite green mana, fueling any massive spells or abilities you care to cast.