Steelfin Whale, Retraction Helix, and Mox Opal

Prerequisites

• Steelfin Whale on the battlefield
• Retraction Helix in hand
• Mox Opal on the battlefield
• Steelfin Whale does not have summoning sickness
• available

Steps

1. Cast Retraction Helix by paying , targeting Steelfin Whale
2. If you control three or more artifacts, activate Mox Opal by tapping it, adding one mana of any color
3. Activate Steelfin Whale by tapping it, returning Mox Opal from the battlefield to your hand
4. Cast Mox Opal by paying
5. When Mox Opal enters the battlefield, Steelfin Whale triggers, untapping Steelfin Whale
6. Repeat from step 2

Results

• Infinite colored mana
• Infinite storm count