If the Pharaoh is a stand alone card, it can be very playable, and even more if the cost is reduced to 8, or the skill cost is reduced to 1 (possibly the 1st option, or would be OP).
About the Mummy, I like the idea very much, but its main problem is that you basicly need to waste a spell on it (or use eternity on your own creature). I suppose no one, unless the stupid AI, will target the mummy with a reverse time. It could be much better with a skill that costs 2
instead.
Oh, and I loved the card art