I'm planning on trying out a similar list this weekend/next week. Only difference is I am planning on going 20x marauders, 5x WoC and a Daemon Prince. Archaon and Varanguard are Mark of Slaanesh because the exploding 6s are fantastic. Demon prince is mark of Khorne for the board control.
Plan is to take Whispers of Chaos on Archaon and binding Damnation on Sorcerer, combined with the DP i will have pretty solid ability to control what the opponent can do with their units and better allow me to safely pick and choose units to destroy.