Way of Dark
Water's Mercy - You and your allies restore 1/2 a heart per second while standing in water.
The Oracle adds an interesting dynamic to your team's strategy. Stake out a defensive area where you have a bit of water to heal yourselves. If you're not in a team, most likely you'll have to choose a secondary ability focused on speed. Dip in and out of the water to heal yourself and whittle down your opponents with your Charge Attack. Though this is a hard road, it's worth it. The Oracle is the only class with access to the Prophet, who gets a very good buff in the next round.
Leads to: Prophet or Sadist