Voltaic Construct + Xenic Poltergeist + The Eternity Elevator

Voltaic Construct

Xenic Poltergeist

The Eternity Elevator

How it works

1. Animate The Eternity Elevator using Xenic Poltergeist.
2. Activate The Eternity Elevator by tapping it, adding CCC.
3. Activate Voltaic Construct by paying 2, untapping The Eternity Elevator.
4. Repeat from step 2.

By transforming The Eternity Elevator into an artifact creature with Xenic Poltergeist, you unlock its potential to be targeted as an artifact creature. This allows Voltaic Construct to repeatedly untap The Eternity Elevator for just two mana. Because tapping The Eternity Elevator initially yields three colorless mana, the loop generates a surplus of mana each iteration, which can then be used to scale up its massive station-based color-filtering ability.