-Undertaker --- This is one of  the staples of this deck. This card makes it so you can either choose an aggro playstyle or just have complete board dominance in the beginning. I would always keep this card in hand at mulligan.

 

-Leper Gnome --- This card is interchangable with Clockwork Gnome, but I personally prefer the 2 damage than the card. Also, it synergyses well with Kel'Thuzad as you can keep throwing the Leper Gnomes to trade them into other minions while still doing damage to the enemy hero.

 

-Mad Scientist --- This card is a must have in this deck. The deathrattle works with Undertaker and it gets a secret, which, if you haven't noticed, is basically the point of this deck.

 

-Kel'Thuzad --- This card is another must have in this deck. Kel'Thuzad combos are limitless as they can do almost anything, like get infinite draws (Loot Hoarder,) or Crazy infinite taunts with Sludge Belcher or Sunwalker.

 

-Sludge Belcher --- This card is also another deathrattle so it works with Undertaker, and it is a taunt, so it works with the Kel'Thuzad loop.

 

-Sunwalker --- I really love this card, especially since the divine shield completely obliterates the enemy board and leaves complete control. This also works with theKel'Thuzad loop, really well.

 

-Knife Juggler --- Now this card isn't necessarily needed but I think its a great addition and synergizes with the Kel'Thuzad loop.

 

-Tirion Fordring --- Sunwalker on drugs, amazing card.

 

-Dr. Boom --- This card is not needed, however I believe it is a nice win condition and target. Due to the fact that this card has 7 mana, you might end up putting this down before Kel'Thuzad or Ragnaros the Firelord. This card draws the cards like Execute, Assassinate, Shadow Word: Death, Hex, or even Big Game Hunter, who seems to be everywhere. Basically, its a target 7/7 to take the hits before you put out Tirion Fordring,Ragnaros the Firelord, or Kel'Thuzad.

 

-Ragnaros the Firelord --- Win Condition, not a must have, but I like it.

 

-Bolvar Fordragon --- In this deck, this card can generate a lot of attack really quick, I have gotten it to a 30/7 on turn 9 because I forgot about it for a few turns and it was sitting there for a while. 

 

**UPDATE** Trying out a Sylvannas Windrunner instead of Bolvar Fordragon

-Loatheb --- I don't like it since GvG, but some people might.

 

-Equality --- I want to put this in somewhere, but I dont know where just yet.

 

-Ironbeak Owl or Spellbreaker --- Silence is always nice.

 

-Sneed's Old Shredder --- Another Win Condition, I don't have it and I don't want to use it, but some might.

 

-Avenging Wrath --- Can work well withEquality or just obliterate the enemy board.

 

-Wild Pyromancer --- Also can work well with Equality.

 

-Sylvannas Windrunner --- This card would be a great card in this deck (I assume) because of the deathrattle and the Kel'Thuzad loop.