by using rares and targeting their water main and out damaging their roshi, don't even focus on Han by the time he gets into action most of his team will be dead, I would suggest using Hanzo sage jiraiya and roshi with fire main but to be honest the only way to kill this team is to kill water main first then roshi then school sakura and Han last. you can switch Hanzo for something else like more damage or a healer if you can't work his poison.