Beneath the Grounds is a Rogue spell card (rarity: epic) that belongs to the "The Grand Tourney" set, which was released on 24.08.2015 and is one of initially 132 cards. The artist of this card was Daren Bader, who also made 20 other artworks for Hearthstone.
The card costs 3 mana and its card text reads: "Shuffle 3 Ambushes into your opponent's deck. When drawn, you summon a 4/4 Nerubian."
The flavor text of the card is the following: Can you hold these eggs for just a second? I promise they're not full of giant enraged undead spider things.
Based on 102 quiz answers, the card is easy to memorize: 93% of them were correct. The question on “Card text” is answered correctly most often (100%), the one on “Cost” least often (83%). An answer takes 6.2 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.