Mulligan for your early curve, take control of the game by turn 3-4 and burn their hp, then enter the end game. Slap down a few 5 or 6 costs and it's corruption time. This is all about controlling the tempo of the game and holding your corrupt for a surprise mid-game beatdown.
Most people you play will instantly think you are Agro Shadow Priest and waste their hand on your early game, and suddenly they have nothing for your phat elephants and massive face damage. Have fun Y'all~~