Reversal of Fortune, and its cousin Reversal of Damage, can be very useful for a dervish if you're running an enchantment oriented build. RoF has pretty much the fastest total recast time in the game (counting casting time plus recharge) and RoD is just one second slower. A build that's using high Mysticism and/or Pious Renewal can basically recast either of these enchantments as fast as they recharge, and even gain energy while doing it.
The combination may not be enough to cover all your healing needs, but it certainly helps take the edge off!
