At 11th level, a white mage can select the following greater exploit.

Greater Spontaneous Healing (Su): A white mage can expend 3 point from her arcane reservoir to use one of her spell slots to cast a cure spell (any spell with “cure” in its name) from the cleric spell list as if it were on her spell list and prepared. The spell must be of a level the arcanist can cast. The quantity of dice rolled, caster level and maximum caster level are doubled.  Example: The damage cured for Cure Critical Wounds increases to 8d8 points of damage + 2 points per caster level (maximum +40).