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It's also telling, however, that Yogg-Saron displays the murder of King Llane Wrynn at the hands of Garon Halforcen. We know that Garona was acting on the orders of the Shadow Council, who had used their warlock magics to condition her over the years.

but we do know that it is possible and even likely that Yogg-Saron was one of the Old Gods who helped to corrupt Deathwing. (Indeed, given his title of The Lucid Dream,Best Place To Buy WOW Gold, Yogg would seem a very likely candidate.)

Yogg-Saron's display of the events of the formation of the Dragon Soul (later known as the Demon Soul) certainly indicates that he either has or claims a level of involvement with the madness that overcame Neltharion.