Try to get Fear on DK soon as possible, Important part comes when Druid pops out. At this point you have to check the Druids buffs for Berserking. This buff makes the Druid immune to Fears, so you don't want to waste your time trying to Fear him. If he has the buff on him when he pops out from stealth cast Deathcoil on him and keep fearing the Death Knight until the buff has ran out, then change to the Druid and have Shaman Hex Death Knight. If he doesn't haven the buff on him cast Fear on the Druid, and save your Deathcoil until he uses Berserking. By doing this you should win. Against this team fast reactions and good crowd control is what matters.