I had a similar question and this forum is the most similar place. I am putting together a Lich who is an oracle of bones and agent of the grave. Across all all 3, you get 3 supernatural touch attacks. I assume you can use 2 of them once your attack bonus reaches +6, but I don't know if you can dual wield them. It'd not actually be that much healing at high levels for a full round action even when dual wielding when compared to just casting harm. I also don't know if you can combine it with an inflict spell.
Death’s Touch (Su)
Lich's Touch (Su)
Lich's Melee Attack