Metaltooth Leaper is a rare Hunter 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 Hideaki Takamura, who also made 61 other artworks for Hearthstone.
The flavor text of the card is the following: Don't leave them out in the rain. In Un'Goro Crater there is a whole colony of rust-tooth leapers.
The card is easy to memorize with 90.35% of correct quiz questions.