Seadevil Stinger is a Warlock minion card (rarity: rare) that belongs to the "Mean Streets of Gadgetzan" set, which was released on 01.12.2016 and is one of initially 132 cards. The artist of this card was Yewon Park, who also made 3 other artworks for Hearthstone.
The card costs 4 mana, has 4 attack and 2 health, and its card text reads: "Battlecry: The next Murloc you play this turn costs Health instead of Mana."
The flavor text of the card is the following: Pretty harmless unless you're a Seadevil.
Based on 94 quiz answers, the card is moderately hard to memorize: 87% of them were correct. The question on “Card text” is answered correctly most often (100%), the one on “Health” least often (71%). An answer takes 6.9 seconds on average. In the Pixel Quiz, which shows only the shape and colour of the card, it was recognised correctly 83% of the time.