Quote Originally Posted by Rongway View Post
The lilies effectively upgrade Cure II and Medica to be instant cast and cost no MP.

Adding a damage dealing, MP restoring lily would be, at best, awkward, because the lilies themselves are meant to be MP positive by saving you from spending MP on CureII/Medica, and then refund some of their damage via Misery.

As for spending Thin Air on Medica or Medica II, there's never a reason to spend it on Medica because Afflatus Rapture is exactly a 0 MP Medica so if you really really need it (you probably don't) you can use Rapture instead of Thin Air + Medica. You could spend Thin Air on Medica II, but if you're sitting on an unused Thin Air just to wait for the opportunity to use it on Medica II, you might never use it because healers have so many oGCD AOE heals that Medica II is often nothing but overheal.
It's also worthy of note that using a Thin Air on a Medica II isn't an MP gain by itself. Thin Air is always 0 MP either way, so as long as you're not using expensive heals outside of it, you can't milk extra mana from it by using more expensive things inside of it.