I have met all conditions with necrovalley on the field, spiritualist on the field and 5 spellcasters total in my hand and field and still doesn't give the option to fusion summon Quintet Magician.

Do you have a replay where it wasn't giving you the option? Because it seems to be working fine on my end.

Of course, it begins at turn 11. At the end i was able to summon it only when gravekeeper's esper wasn´t on the extra zone.


EDIT: Reading the effect of spiritualist in english, it says OR in the hand. For a moment i got it optional inclusive and not optional privative of the other option, is it like that?

Sorry for the late reply.

This was a bug with "Harmonizing Magician" if I recall correctly and it should be already fixed.