Dreadship Reef (C16) from Commander 2016, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Lars Grant-West
• Card Text:
  T: Add C to your mana pool.
  1, T: Put a storage counter on Dreadship Reef.
  1, Remove X storage counters from Dreadship Reef: Add X mana in any combination of U and/or B to your mana pool.