Cassandra

Cassandra was given the ability to see the future by Apollo: when she refused him, he cursed her with the provision that her prophecies would never be believed.

W.I.P. and Jeopardy question

She was given the gift (gift?) of prophecy with one disadvantage...

I chose this as the oracular shell from among those below (and replaced the book cover with this piece of plain wood)

The final on Monday.