Cogmaster's Wrench is a Rogue weapon card (rarity: epic) 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 6 other artworks for Hearthstone.
The card costs 3 mana, has 1 attack and 3 durability, and its card text reads: "Has +2 Attack while you have a Mech."
The flavor text of the card is the following: For tightening cogs and smashin' troggs!
Based on 118 quiz answers, the card is moderately hard to memorize: 85% of them were correct. The question on “Name” is answered correctly most often (100%), the one on “Cost” least often (50%). An answer takes 6.8 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.