Mox Opal + Tidespout Tyrant

U identity

Commander legal

The 2 combo pieces

What must be in place

You control at least three artifacts.
You control a nontoken permanent that can be cast using one colored mana.

How to execute it

  1. Cast Mox Opal by paying its mana cost.
  2. Tidespout Tyrant triggers, returning a nontoken permanent that can be cast using one colored mana from the battlefield to your hand.
  3. Activate Mox Opal by tapping it, adding one mana of any color.
  4. Cast the nontoken permanent returned in step 2 by paying its mana cost.
  5. Tidespout Tyrant triggers, returning Mox Opal from the battlefield to your hand.
  6. Repeat.

What the combo produces