<Hello friend>
Basically you’re trying to get a mill combo but it is far more common to win without pulling off the combo.
So how does the deck work?
Coldlight Oracle and Baleful Banker let both players draw 2 cards while you’re shuffling a single Shudderwock into your deck to counter the fatigue damage by a bit.
All the other cards are there to stall the game, gaining health so you won’t die, some card draw and of course making copies of your Shudderwock.
In a perfect world where you’ve played every single battlecry card you are Dirty Ratting your opponents hand while doing 3dmg to the board from your Hagatha the Witch, making your opponents spells cost 5 more with Loatheb and gaining the battlecry of Reno Jackson, Antique Healbot, Lifedrinker for outhealing the fatigue damage. While making copies of your Shudderwock with Doppelgangster and Saronite Chain Gang
All the other battlecry cards are beneficial but not that important: Glacial Shard, Brrrloc, Mind Control Tech and Gluttonous Ooze
Note: Jinyu Waterspeaker is here to survive against aggro as example, the battlecry will randomly target a minion, you or even your opponent with Shudderwock. But the card will do you more good than harm, which is why it’s included.