Reducing its attack would give it less value per card played. Aether has always been about card advantage, and reducing the attack would actually make it even less used and particularly even more overshadowed by Elite Phase Dragon.
Cost logic aside, you still have to look at how practical cards actually are. The calculation can make 100% sense, but the card itself still won't be used if it's overshadowed. That's why -1 cost or +1 attack are the only changes I can see making this card more used.