Houndmaster is a Hunter minion card (rarity: free) that belongs to the "Legacy" set. The artist of this card was Dan Brereton, who also made 5 other artworks for Hearthstone.
The card costs 4 mana, has 4 attack and 3 health, and its card text reads: "Battlecry: Give a friendly Beast +2/+2 and Taunt."
The flavor text of the card is the following: "Who let the dogs out?" he asks. It's rhetorical.
Based on 103 quiz answers, the card is easy to memorize: 95% of them were correct. The question on “Cost” is answered correctly most often (100%), the one on “Attack” least often (84%). An answer takes 5.6 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.