Quag Sickness is a common rarity card (#111) from the Magic 2011 set of Magic: The Gathering, illustrated by Martina Pilcerova. Valued at approximately $0.05, it features a unique mechanic that allows players to impose a -1/-1 counter on target creatures, reflecting the game's strategic depth. As a staple in certain formats, its low price point makes it an accessible option for collectors and players alike.