Light of the Naaru is a Priest spell card (rarity: rare) that belongs to the "Goblins vs. Gnomes" set, which was released on 08.12.2014 and is one of initially 123 cards. The artist of this card was Jesper Ejsing, who also made 16 other artworks for Hearthstone.
The card costs 1 mana and its card text reads: "Restore 3 Health. If the target is still damaged, summon a Lightwarden."
The flavor text of the card is the following: "Light it up!" - Command given to both Lightwardens and Goblins holding Flamecannons.
Based on 98 quiz answers, the card is moderately hard to memorize: 89% of them were correct. The question on “Card text” is answered correctly most often (96%), the one on “Name” least often (80%). An answer takes 5.5 seconds on average.