Magewright's Stone, Synod Artificer, and Empowered Autogenerator

Prerequisites

• Magewright's Stone on the battlefield
• Synod Artificer on the battlefield
• Empowered Autogenerator on the battlefield
• Synod Artificer does not have summoning sickness
• Empowered Autogenerator has at least two charge counters on it

Steps

1. Activate Empowered Autogenerator by tapping it, putting a charge counter on it and adding at least three mana of any color
2. Activate Synod Artificer's second ability by paying and tapping it, untapping Empowered Autogenerator and Magewright's Stone
3. Activate Magewright's Stone by paying and tapping it, untapping Synod Artificer
4. Repeat

Results

• Infinite charge counters on Empowered Autogenerator
• Infinite colored mana
• Infinite untap of noncreature artifacts you control