Hearthpwn

Any other Rare card upgrades that you would consider LOKShadow?

Im not sure which part you found interesting but i found it interesting that you would pick Acidic swamp ooze out of all the cards as it IS a great tech card, not the kind of cards i was referring to when i said mana wyrm. But in a meta where weapon classes are popular atm i would definitely suggest just 1 acidic swamp oozes because you should only run 1 tech card. To further your chances of drawing that card in particular the tip of putting "2" Arcane Intellects in your deck would help out quite a bit. 

3 or 2 classes at most? i have seen ALOT of hunters,shamans,rogues,warriors and even paladins on the ladder between rank 20-5.

You are right about having a lot of different cards can compromise your reliability in drawing the right cards, thats why people usually put Reno Jackson in these types of decks because they will most likely take a few hits to the face before they can deal with the opponents minions. If you are looking for a more consistent deck i would definitely stick to having 2 copies of each card in the deck assuming they are decent cards, for example 2 mana wyrms in a mage deck would be nice.

The reason Yogg is played in competitive decks is because it is the best card to play while playing from behind, meaning if you are behind on board control Yogg is the best card to play to catch back up. Even though his spells are random/rngesus that still doesn't change the fact that Yogg is the single best card to play from behind.

In fact when you look at what Jaraxxus does he is great in control match ups and comes with a lot of burst for 9 mana. Can you think of any other card that is 9 mana that you can get insane value out of in control match ups? I can Ysera! XD if you have Ysera i would say replace Jaraxxus with Ysera.  Ysera comes with burst as well with nightmare or awaken's, it can also generate nice minions for a low cost just like Jar's HP!