I had the same exact questions/concerns w/ Pharaoh as Gmac. Pharaoh is my fave but he has his quirks.
Thank you for clarifying what entomb was intended for. Way too much setup involved to ever make this worthwhile on this character IMO.
Also, the talisman change makes sense EXCEPT with Pharaoh's other mostly useless ability "Mend" which scales on magic. Since every other ability works with HP, defense and attack isn't this silly? Especially since you're changing the one talisman that allows for a little magic juice? (Nobody will use the open slots for magic based on his other abilities). Have you considered changing this attack to be scaled on defense or at least attack damage? That would be great and make the tali change make sense.