Ragnaros, Lightlord is a Paladin minion card (rarity: legendary) that belongs to the "Whispers of the Old Gods" set, which was released on 26.04.2016 and is one of initially 134 cards. The artist of this card was James Ryman, who also made 287 other artworks for Hearthstone.
The card costs 8 mana, has 8 attack and 8 health, and its card text reads: "At the end of your turn, restore 8 Health to a damaged friendly character."
The flavor text of the card is the following: What happens when you try and corrupt a corrupted firelord? DOUBLE NEGATIVE, INSECT!
Based on 105 quiz answers, the card is easy to memorize: 100% of them were correct. Every question type has the same hit rate: 100%. An answer takes 4.6 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.