Yomiji, Who Bars the Way, Mox Opal, and Grinding Station

Prerequisites

• Yomiji, Who Bars the Way on the battlefield
• Mox Opal on the battlefield
• Grinding Station on the battlefield

Steps

1. Activate Grinding Station by tapping it and sacrificing Mox Opal
2. Yomiji triggers, returning Mox Opal from your graveyard to your hand
3. Resolve the Grinding Station ability, causing target player to mill three cards
4. Cast Mox Opal by paying
5. When Mox Opal enters the battlefield, Grinding Station triggers, untapping Grinding Station
6. Repeat
7. If you control at least one additional artifact, you may also activate Mox Opal once per loop, resulting in infinite colored mana

Results

• Infinite colored mana
• Infinite mill
• Infinite self-mill
• Infinite storm count