Dreadship Reef (CM2) from Commander Anthology Volume II, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Lars Grant-West
• Card Text:
  T: Add C.
  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.