Ashaya, Soul of the Wild, Karn, Silver Golem, Basalt Monolith, and Mirari's Wake

Prerequisites

• Ashaya, Soul of the Wild on the battlefield
• Karn, Silver Golem on the battlefield
• Basalt Monolith on the battlefield
• Mirari's Wake on the battlefield
• Basalt Monolith does not have summoning sickness
• available

Steps

1. Activate Karn by paying , causing Basalt Monolith to become an artifact creature until end of turn
2. Activate Basalt Monolith's first ability by tapping it, adding
3. Mirari's Wake triggers, adding
4. Activate Basalt Monolith's second ability by paying , untapping it
5. Repeat from step 2

Results

• Infinite colorless mana