Fel Cannon is a rare 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 Matt Gaser, who also made 9 other artworks for Hearthstone.
The card costs 4 mana, has 3 attack and 5 health, and its card text reads: "At the end of your turn, deal 2 damage to a non-Mech minion."
The flavor text of the card is the following: The box says, "New and improved, with 200% more fel!"
Based on 111 quiz answers, the card is moderately hard to memorize: 87.39% of them were correct.