Sentinel Spider is a creature card from the Magic: The Gathering Core Set 2013, classified as an Unknown rarity. Valued at approximately $0.11, it features a foil finish that distinguishes it from its non-foil counterparts. As a 3/5 creature with reach, it serves a strategic role in various green decks, particularly in limited formats. Its low market value reflects its common utility rather than rarity, making it accessible for collectors and players alike.