Mox Opal, Retraction Helix, and Rona, Herald of Invasion // Rona, Tolarian Obliterator

Prerequisites

• Mox Opal on the battlefield
• Retraction Helix in hand
• Rona, Herald of Invasion // Rona, Tolarian Obliterator on the battlefield
• Rona does not have summoning sickness
• You control at least three artifacts

Steps

1. Activate Mox Opal by tapping it, adding
2. Cast Retraction Helix by paying , targeting Rona
3. Activate Rona by tapping it, returning Mox Opal from the battlefield to your hand
4. Cast Mox Opal by paying
5. Rona triggers, untapping itself
6. Activate Mox Opal by tapping it, adding one mana of any color
7. Repeat from step 3

Results

• Infinite colored mana
• Infinite storm count