Karn, the Great Creator, Pemmin's Aura, and Chromatic Orrery

Prerequisites

• Karn, the Great Creator on the battlefield
• Pemmin's Aura in hand
• Chromatic Orrery on the battlefield
• Chromatic Orrery does not have summoning sickness
• available

Steps

1. Activate Karn's first loyalty ability, causing Chromatic Orrery to become an artifact creature until end of turn
2. Cast Pemmin's Aura by paying , enchanting Chromatic Orrery
3. Activate Chromatic Orrery by tapping it, adding
4. Activate Pemmin's Aura by paying , untapping Chromatic Orrery
5. Repeat from step 2

Results

• Infinite card draw
• Infinite colored mana
• Infinite colorless mana