Skill, just wondering, have you read any of my balance suggestions? A few of the power/life numbers you suggested make the heros vulnerable to paradox. The primary pursoe of most of these is the ability, not damage. As for the high life totals, a fire or dark deck could dispartch most of these extremely quickly through the use of fire lance or life siphons. Assuming that the fire or dark produced mana at the same rate as any deck using one of the heros, siphon or lance would only deal 6-9 damage when the first hero card came on the table. The problem is that assumption is wrong. Dark has access to devourers, a card that not only speeds up the dark decks production, but also slows down the opponents production. Its not unreasonable to expect a dark deck to be pushing 40-50 quantums before the opponent plays their first hero card. As for fire, not only do lances deal more damage than spihons, cremation gives a massive amount of fire quanta, and fire has access to a creature card that also produces fire quanta. Its not unreasonable to expect a good fire deck to be able to deal 21 damage with a lance by the time a light or air deck got their first hero out. The defense on these creatures needs to be pretty substantial.
This brings up another point I hadn't thought of earlier. These cards all cost 20 quanta. In specific decks (FFQ, time, dark, fire, I'm looking at you), it would be possible to play a hero far earlier than in any other deck. Costs would probably need to be adjusted for the Life, Dark, and Fire heros, and perhaps the Light or Time heros as well.
I also feel the need to reiterate that the aether hero should not have immortality.