to op. made 2h and monks obsolete. probably shield too. this happened right around the time Nepenthe played his storm paladin. looks like he didn't tweak down some of the lag skills after he abused them.
binder thief could kill a champion
trapper thief probably could too with some big boneshatter traps and stealing all the champ's weapons
abs invoker with rain of stones and iceshards perhaps?
poison shaman with healing curse?
the problem with an assassin is that fend can prevent kotegaeshi from ever being attempted. and if so, easy to recall away.
how many hero champions are there? 8? 9 if you include that worthless dwarf herald sitting on all that nice gear?