Nimbus Maze (FUT) from Future Sight, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Jason Chan
• Card Text:
  T: Add 1 to your mana pool.
  T: Add W to your mana pool. Play this ability only if you control an Island.
  T: Add U to your mana pool. Play this ability only if you control a Plains.