I played a bunch of Arena today. TGT seems to have shaken things up a lot. Whether the cards are great or not, you at least have to pick them pretty often.
- I've seen very little Joust, and Jousts rarely pay off. A lot of this is that almost all Arena decks have a bunch of cheap creatures. You're extremely likely to tie.
- Inspire is everywhere and it's game-winning. Inspire effects that improve your board position can get out of control pretty quickly. Silver Hand Regent is strong. Murloc Knight can be incredible. Lots of people are running the Windfury Inspire creature but it's not very impressive.
- Dilution of the card pool means less reliable removal, aoe, and healing. I think this hits Mages particularly hard. Paladins seem to have gotten some really nice new toys, especially Seal of Champions. Another weapon is always nice too. Warhorse Trainer can be strong if you've got some means of making lots of recruits (like Silver Hand Regent).