Karn, the Great Creator, Pemmin's Aura, and Empowered Autogenerator

Prerequisites

• Karn, the Great Creator on the battlefield
• Pemmin's Aura in hand
• Empowered Autogenerator on the battlefield
• Empowered Autogenerator does not have summoning sickness
• Empowered Autogenerator has at least two charge counters on it
• available

Steps

1. Activate Karn's first loyalty ability, causing Empowered Autogenerator to become an artifact creature until end of turn
2. Cast Pemmin's Aura by paying , enchanting Empowered Autogenerator
3. Activate Empowered Autogenerator by putting a charge counter and tapping it, adding equal to charge counters on Empowered Autogenerator
4. Activate Pemmin's Aura by paying , untapping Empowered Autogenerator
5. Repeat from step 2

Results

• Infinite colored mana