Overall very interesting, creative and I think balanced. Has some OP class cards, like every other class.
Only Ancient keeper worries me a bit. 4-10 seems a bit too strong to me, but it will probably die by itself without being a nuisance too much. 5 mana is appropriately costed for a card like this. Can be strong with heals though.
Also, I didn't like deal 1-4 damage type of rng cards.