Guardian of Kings is a Paladin minion card (rarity: free) that belongs to the "Legacy" set. The artist of this card was Erik Gist, who also made 9 other artworks for Hearthstone.
The card costs 7 mana, has 5 attack and 7 health, and its card text reads: "TauntBattlecry: Restore 6 Health to your hero."
The flavor text of the card is the following: Holy beings from the beyond are so cliché!
Based on 138 quiz answers, the card is easy to memorize: 94% of them were correct. The question on “Cost” is answered correctly most often (100%), the one on “Name” least often (88%). An answer takes 6.1 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.