How can you create a combo with Underworld Breach, Grinding Station, Mox Opal?
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[START OF COMBO]This combo can be formed with Underworld Breach, Grinding Station, Mox Opal

Color identity: R
Mana cost: 
Steps:
  1. If you control three or more artifacts, activate Mox Opal by tapping it, adding one mana of any color.
  2. Activate Grinding Station by tapping it and sacrificing Mox Opal, causing yourself to mill three cards.
  3. Cast Mox Opal from your graveyard for its escape cost by exiling three cards from your graveyard.
  4. When Mox Opal enters the battlefield, Grinding Station triggers, untapping Grinding Station.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite self-mill
  - Near-infinite storm count
  - Near-infinite colored mana[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
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