Reno Jackson is a new Hearthstone card which can heal you to full and crippled some decks but was specially harsh with a specific one: Face Hunter.

Face Hunter goes on a "all or nothing" rampage with disposable minions, weapons and burn spells. The plan is to kill you before your big guns come into play and was reasonably succesful, and since it was quick and cheap (money wise) it was the classic hated deck in the ladder.

On the same way it was frustating to lose with a hand full of mighty dragons, it's equally frustating to see all the damage you piled up disappear in a flash of light. This frustation, I believe, is what will make people stop playing Face Hunter.