One huge spender that comes to mind is Sylvan Viridian, Magi, or Shamans just from having played though. Viridian is off-set by hive so maybe not so bad?
As an Alchemist I haven't used a whole lot of Physiology, but Alchemy (other than gold) and Transmutation don't seem to use this resource at all.
A male voice is heard through the membrane, "Hey, girl."
A male voice is heard through the membrane, "Are you an Apostate? ..because you just tore my heart out."