I am right now on the 63% percent of winrate on this deck and this is because we have the ace in the sleeve - Yogg-Saron, Master of Fate. Against aggro, it is sometimes hard, but it depends. The best matchup is the control and midrange decks. This is literally the Priest slayer deck. The best thing about this deck - it is fun and interactive to play.
Don't afraid to play Efficient Octo-bot earlier, because it is not your aim. The main resource of cheapening is Preparation and filling the Yogg-Saron, Master of Fate. The Alexstrasza the Life-Binder is also free to play on turn 9, it will stun the opponent like the Efficient Octo-bot.
Try to keep secrets, card draw, and the Sparkjoy Cheat. Against aggro keep the Prize Plunderer and Efficient Octo-bot. In neutral matchups as always Wand Thief, Kazakus, Golem Shaper and Mankrik. If you got the Bamboozle keep it if you want to have an advantage on the coin.