After i saw some items with the “cast on kill” Mechanik, i feel that i have to suggest that you should avoid this. This mechanic. as cool as it sounds in first Place is as bad when it comes to single enemys (especially Bosses). Imho its one of the worst mechanics in PoE. You will never see the full potential of such an items because for clearing “trash”-enemys you dont need it and for Bosses you cant use it. Better replace it with something like “%chance to cast on attack”.
Think about that
Thanks for the advice!