If you can manage to get the right items or be lucky, I'd say cleaver start with ductape would be good, use one energy for 100+ damage (Not counting modifiers, upgrades, ect.) x3 on its own is great, but coupling that with a few energy items and upgrades you could do like 700+ damage a turn! ofc this is all estimation cause it's alot of work to get the cleavers themselves, not to mention the surplus effort to get the ducktape.
Yeah cleaver build with lots of cleavers seems OP. Just thinking about what hawkeye bow shooting 6 ethereal arrows can do tho... and you can also orient the arrows so they can use empty spaces on both sides (one way to do this would be to put bow in the middle 3 squares on the top then put arrow wand in bottom left and bottom right corners, then rotate arrows so they face inwards, and have a black manastone fueling it all). Seems a bit overcomplicated when cleavers are prob just better, but I'd like to see it done.