Raven Idol is a Druid spell card (rarity: common) that belongs to the "The League of Explorers" set, which was released on 12.11.2015 and is one of initially 45 cards. The artist of this card was A. J. Nazzaro, who also made 73 other artworks for Hearthstone.
The card costs 1 mana and its card text reads: "Choose One -Discover a minion; or Discover a spell."
The flavor text of the card is the following: Was petrified when it found out it didn't make the cut for Azerothian Idol.
Based on 101 quiz answers, the card is easy to memorize: 94% of them were correct. The question on “Card text” is answered correctly most often (97%), the one on “Cost” least often (92%). An answer takes 5.7 seconds on average. In the Pixel Quiz, which shows only the shape and colour of the card, it was recognised correctly 90% of the time.