Riptide Chronologist is a creature card from the Magic: The Gathering Onslaught set, classified as an Unknown rarity. Valued at approximately $0.25, it features a unique ability that interacts with the game's time manipulation mechanics. While not a high-value card, it appeals to collectors interested in the thematic elements of the set and the broader context of blue control strategies. Its market presence reflects its niche appeal among players and collectors alike.