Karn, the Great Creator, Pemmin's Aura, and Gilded Lotus

Prerequisites

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

Steps

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

Results

• Infinite colored mana