Sludge Monster is a creature card from the Magic: The Gathering Innistrad: Double Feature set, classified as Unknown rarity. Valued at $1.23, it appeals to collectors for its unique artwork and thematic relevance within the set, which combines elements of horror and gothic fantasy. Its current market position reflects the card's niche appeal and the broader collector interest in the Innistrad series. Sales data indicates stable demand among players and collectors alike.