[quote=@Burthstone]
But doesn't Karn use magic constantly to sustain his forms?

I don't think he'd be able to sustain a dragon from for very long.
[/quote]

Nope not at all xD it would last maybe five minutes if he was at a full recovery. Probably less without dying.

But it would be enough to make him happy.

Edit: Maybe Karn should be that guy for

"Next time on Phoenix Wing..."

Or 

"Last time on Phoenix Wing..."