12 flying damage for 10 isn't bad, but the upkeep cost kind of relegates this to mono-red decks. That in itself isn't a problem though (Necro-Impotence is pretty much only going to be played in mono-black decks, but that doesn't make it bad). I think card's pretty good, despite its high initial cost. It's probably going to burst through any defender that can be thrown in front of it and it'll hurt if nothing's put in front of it at all. Pretty solid for a Dragon.
Pros: Big 'n' beefy flying double striker
Cons: Costs 10, upkeep cost