Quag Sickness | Magic: The Gathering
Formats Quag Sickness is Legal in
Official Oracle Text for Quag Sickness
Enchanted creature gets -1/-1 for each Swamp you control.
Official Rulings for Quag Sickness
8/15/2010 : This bonus is not fixed; it changes as the number of Swamps you control changes.
8/15/2010 : The ability cares about lands with the land type Swamp, not necessarily lands named Swamp.