Thrive in the Shadows is a Priest spell card (rarity: rare) that belongs to the current "Core" set. The artist of this card was Patrik Bjorkstrom, who also made 73 other artworks for Hearthstone.
The card costs 2 mana and its card text reads: "Discover a spell from your deck."
The flavor text of the card is the following: Why would your spells be afraid of the dark? It's easier to nap there.
Based on 65 quiz answers, the card is moderately hard to memorize: 89% of them were correct. The question on “Cost” is answered correctly most often (100%), the one on “Name” least often (78%). An answer takes 6.1 seconds on average.