Penflinger Hunter (Legend) - Scholomance Academy

Penflinger is one of those cards that can create entire archetypes, and it just so happens that Hunter is the best class for it. Arcane Fletcher and Penflinger have crazy Synergy, and with Hunter having access to so many low cost and Twinspell cards, you get plenty of Penflinger value. I've had great success in ladder, especially against Druid, Demon Hunter, and Rogue decks. Struggles against Control decks, however.