Backstab is a Rogue spell card (rarity: free) that belongs to the "Legacy" set. The artist of this card was Michael Sutfin, who also made 2 other artworks for Hearthstone.
The card costs 0 mana and its card text reads: "Deal 2 damage to an undamaged minion."
The flavor text of the card is the following: It's funny how often yelling "Look over there!" gets your opponent to turn around.
Based on 177 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 (88%). An answer takes 5.1 seconds on average. In the Pixel Quiz, which shows only the shape and colour of the card, it was recognised correctly 88% of the time.