Cogmaster's Wrench is a epic Rogue weapon 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 Richard Wright, who also made 7 other artworks for Hearthstone.
The flavor text of the card is the following: For tightening cogs and smashin' troggs!
The card is on average to memorize with 84% of correct quiz questions.