Abjuration 11
Divination 6
Transmutation 10
I'm torn, because I love Abjuration and Transmutation Wizards, but man I wish the Diviner's features were in other classes. Portents would be so juicy for an oracle cleric (and I hate clerics), or the spirits Bard, or the Stars Druid could be allowed to be a potent diviner by way of the stars. If the warlock was a little less beholden as a class to the idea of a patron that is giving you power, a classic oracular witch could be done with a Pact of The Bones.
Yeah, I really wish they’d expand the pact boons dramatically.There are entities that could give oracular powers. Beings like the Fates or Norns; an embodiment of Destiny like the Endless of the same name; a powerful time elemental; or even something like Odin's ravens, or other beings serving a God of fate or Divination. Making a sacrifice of some kind to such an entity in exchange for future sight is suitable for the concept of an oracular witch style character. I like the idea of a Pact of the Bones, it is a cool idea. Although having the option of using runestones, animal entrails, or even tea leaves, etc, would allow for more concepts.