Well, Death Sentence sounds like it would be broken in PvP, but it depends how easily it can be dispelled.
Counter Spell can be pretty nifty in situations where you really need enemy magic circles gone.
Change is a 60 second cooldown and an Overheat spell, and with maxed attribute has a chance to place the item jackpot effect on the target at a 5% chance. Now that sounds a bit low, but considering you can use it at least once every 30 seconds means that with a patient party you could farm the poop out of bosses (assuming Change works on them, not sure).
With Clairvoyance you could gauge more easily whether its worth engaging a mob just by checking what it will drop.
If all these skills worked on bosses I could see Oracle actually being pretty useful for a coordinated boss hunt.