Land cards that offer choices on the mana they produce become useful when your deck is duo-coloured or more. Frost Marsh also adds the Snow element to my deck – its not something I’ve gone into before but could be useful if I trick out my deck.
Image: http://resources.wizards.com/Magic/Cards/CSP/en-us/Card121212.jpg
Set: Coldsnap
Availability: Uncommon
