Voltaic Construct + Toymaker + Prismatic Geoscope

Voltaic Construct

Toymaker

Prismatic Geoscope

How it works

1. Animate Prismatic Geoscope using Toymaker.
2. Activate Prismatic Geoscope by tapping it, adding at least three mana of any color
3. Activate Voltaic Construct by paying 2, untapping Prismatic Geoscope.
4. Repeat from step 2.

This delightful loop transforms a humble mana rock into a powerhouse by leaning on Toymaker to turn Prismatic Geoscope into an artifact creature, allowing it to benefit from creature untap effects while retaining its domain mana-producing ability. Once it can tap for three or more mana, you simply channel a portion of those profits into Voltaic Construct to untap the animated Geoscope, leaving you with a surplus of colored mana and an infinitely repeatable engine.