Well, maybe this is a little too on the nose, but....
2d6 Transform, Air into Mana Sword, Standard Effect Rule, Skill Roll, the Professor and the rest, etc.
This is if you want the sword to be an honest-to-God real, solid object that anybody could pick up, touch, see, and so on. The "heal" for this Transform is a certain amount of time passing or until the creator goes unconscious, whichever comes first.
2d6 HKA, OIF: Mana Sword
The attack itself. OIF because even if it's knocked from you hand, taken from you, etc., you can do another Transform to make another one, making it Inaccessible.
Wacky enough for you?