I've tried duels with and without spawnpoints four all four mages, and I have come to find that:
1) In a typical turtling temple build, the Temple of Asyra is very good. That book will last so long that you will easily get your mana/actions back from it. It is a considerable commitment though when you count up the initial mana cost, the cost of the two clerics (and their actions), and a possible Harmonize. Hmm, maybe I dont like it as much as I thought...
2) Likewise, for my favorite wizard book the Gate is very useful as I'm mostly teleporting around and blowing things up with various lightning effects while the gate steadily gains 3-4 mana a round if I get a Harmonize up on it, which lets me nuke while the big beasts of death get some bonus mana. I think this is a must have for my play style. It's really efficient too.
3) The Lair... it's fun to use it for 2-3 creatures a round, but the swarm deck is not my favorite. I guess it isn't the lair's fault, but ... bleh.
4) The Pentagram, as mentioned above, is just terrible. I use the Battle Forge with the Warlock, but I can't imagine a time I'd ever put the Pentagram in my book. Much like the Gate, the Forge allows my warlock to go get busy with the Lash while gearing me up for "free" in terms of my actions.
@Koz: Thanks for the confirmation on my Arcane creature opinion. I love them and just feel bad for the other schools when I start spamming control effects at range in every game.