I like most ideas of your card. Some would be really great in Elements; archer, palace's guard.
I'm totally against the hero idea, for the reason someone explained in ScaredGirl thread; once there is a "hero" with such powerful abilities, he's quite a goal for the player, it destroys the variance of decks.
I'm going to create a new topic because i got lots of cards ideas, and i wanted to be sure i would not create an unintentionnal copy of an already posted idea, so i looked at your topic. Good work here, mostly. I agree with mosts of bobcamel feedbacks.
I think it's written somewhere else in the forums, and i'm not sure anyway, so: to avoid a spell-blocking shield, to still hurt ennemy with a spell, i think you got to use a spell-blocking shield yourself, then hit yourself with the spell. That "trick" or exploit does not justify to avoid creating a card such a Gravity Bolt. I would still increase its damage to 2 per 10 gravity quanta.
