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If tapped for mana, Plains produce 
, Islands produce 
, Swamps produce 
, Mountains produce 
, and Forests produce 
instead of any other type.
Illustrated by Mark Tedin
Rulings (3)
Oct 4, 2004
If a player uses a text-changing effect to make a land type be listed as producing two different colors, 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.
Oct 4, 2004
The ability generates a replacement effect.
Apr 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.
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