Floating Watcher is a common Warlock minion card 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 Todd Lockwood, who also made 3 other artworks for Hearthstone.
The flavor text of the card is the following: "Evil Eye Watcher of Doom" was the original name, but marketing felt it was a bit too aggressive.
The card is on average to memorize with 90% of correct quiz questions.
