As SMN I raise anyone who is down if the healer isn't able to for whatever reason. Raises do use a lot of MP but if you can use Aetherflow it's not such a huge drain. I do put priority on the tanks and healers, though. OTOH, raising a WHM if you don't also have a bard is not the best solution since they will raise with no MP and even with Shroud of Saints and/or Ether potions, will be slow to regen MP. Scholars are a little better off since they can pop Aetherflow.