thus removing the possibility of rereading the thread to see if you find something relevant
as to possible incantations... I'm just giving brief descriptions of things that seem likely. Most are from cantrip to lvl 2 strenght
good luck and bad luck (- or + roll on skill checks or, yer or, attack. not both), good/bad fortune (more powerfull version of g/b luck) either a bigger bonus/penalty or aplicable to more rolls.
Death curse/blessing. I believe this subject is also touched in BoVD. Its more or less 'the dying breath curse' or blessing in this case. You should need very high requirements to pull this off, since dying curses and stuff tend to be very powerfull as they are fueled by your life.
fora n incantation using sneak: draw shadows. Make a 'cloak' of shadows that help to hide you. In other situations than darkness you should not ask for shadows but adapt the incantation acordingly
diablery variety would affect the guard's vision instead of hiding you. So instead of giving you a bonus it would give someone else a penalty
Sooo, I'm mostly going for passive, term effects (not much instantanous, mostly several hours and the like)