I just found Asuma/Sai/Sakon by accident when I got all three around the same time and I fought the Kakashi clone, but I don't know how it'd work with the water main.

But anyway, I used my 0 chakra consumption move plus Sai's 0 consumption clones, then I built up chakra until starting round 2 I spammed the Kakashi clone with Flying Swallow and the resulting combos.

Well, you wanted unique OuO

Don't even remember; I think it was Chameleon.