Apply Agony and keep it up. Apply Corruption and keep it up. Apply Unstable Affliction and keep it up. Cast Haunt when: you have a Soul Shard; Haunt's debuff is not applied on the target; you will not have to refresh any of your DoTs for the next 8 seconds; you will not need to use Life Tap in the next 8 seconds. Cast Malefic Grasp as a filler.