|Last of the cards; click to enlarge.|
Palace is a Village-type card, just with a little extra bonus; it's specialty here is that the Treasure you draw will have some variance. Other cards in official expansions have similar features, so it's nothing too new; I just put the mechanic on a Village.
Pyramid, I figure, will often have a use, but beginning players might not think of the best way to utilize it unless Curses are present (and if you're using Will of Ra's Curses, you'll definitely want this). But for more experienced Players, they'll think to trash Coppers or other cards that are clogging their deck.
Scribe is a neat little card that gets more powerful the later you play it in your Action Phase. I always liked cards with some variance to them, like the price of Peddler from Dominion: Prosperity, so this is something along those lines.
Sphinx is a fun little gamble: if you really, really want those four extra cards, you're going to have to take a little hit for them.
Once upon I time I began a very complicated military-themed expansion for Dominion, which had Reaction Attacks. These basically were Reactions that caused an Attack, and generally their trigger was being attacked, so you would end up with nested Attacks and huge combos of cards bouncing off each other with lots of Players throwing down Reaction after Reaction to cancel each Attack that kept coming through. Well, that was a mess of a game that was hilarious the first time it happened, but would quickly devolve into nonsense.
So anyway, Vizier is a little taste of that. It's not an Attack, but still does something nasty to the Attacker. It's not going to block an Attack like a Moat would (from vanilla Dominion), but it serves its usefulness by making Players think twice who would ordinarily play lots of Attacks.