Lightning Storm is a Shaman spell card (rarity: rare) that belongs to the "Legacy" set. The artist of this card was Christopher Moeller, who also made 7 other artworks for Hearthstone.
The card costs 3 mana and its card text reads: "Deal 3 damage to all enemy minions. Overload: (1)"
The flavor text of the card is the following: An umbrella won't be effective, I'm afraid.
Based on 184 quiz answers, the card is easy to memorize: 95% of them were correct. The question on “Name” is answered correctly most often (100%), the one on “Cost” least often (84%). An answer takes 4.5 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.