Pass if you don't need. Need if you need, but say something first. Greed if you're a disenchanter. If everyone passes, stand around asking if anyone is an enchanter. Once you're sure no one is, do greed/need for the rest of the run. Enchanters, please speak the fuck up.
Greed mostly. Need if you need and then you'd better equip it right there or you will be declared a ninja.
My rule book also says to not listen to hunters. I am considering adding mages to it as well.