Reality Twist | Magic: The Gathering
Formats Reality Twist is Legal in
Official Oracle Text for Reality Twist
If tapped for mana, Plains produce , Swamps produce , Mountains produce , and Forests produce instead of any other type.
Archmage of the Unseen
Official Rulings for Reality Twist
4/15/2013 : If a land has more than one basic land type, the player tapping the land for mana can choose to produce mana of either color. But if it produces more than one mana, all mana is of the same color.