"Mercy Killing" is a card from the Shadowmoor set of Magic: The Gathering, classified as an Unknown rarity. Currently valued at $1.41, it appeals to collectors for its unique mechanics and thematic relevance within the set. The card's ability allows players to interact with their opponent's creatures, making it a strategic choice in gameplay. Its market presence reflects the fluctuating interest in Shadowmoor cards among both casual and competitive players.