Hydrologist is a Paladin minion card (rarity: common) that belongs to the "Journey to Un'Goro" set, which was released on 06.04.2017 and is one of initially 135 cards. The artist of this card was Matt Dixon, who also made 302 other artworks for Hearthstone.
The card costs 2 mana, has 2 attack and 2 health, and its card text reads: "Battlecry:Discover and cast a Secret."
The flavor text of the card is the following: Murloc hydrologists are pretty rare. Most murloc undergrads pick computer science.
Based on 84 quiz answers, the card is easy to memorize: 95% of them were correct. The question on “Card text” is answered correctly most often (100%), the one on “Cost” least often (92%). An answer takes 6.0 seconds on average. In the Pixel Quiz, which shows only the shape and colour of the card, it was recognised correctly 100% of the time.