Thanks for the scans. :)
Nature's Swiftness is generally awful. It is designed purely to be a degenerate combo card, and even its wording nerfs it from doing something really scary like that. Perhaps it will have some form or use with Circle of Life or whatever, but I'm not counting on it.
Forbidden Knowledge also looks nifty, but I can't imagine it actually being good unfortunately, if there is any amount of ability-hindering in this set. I mean, even a 1 drop makes you lose with it, but this ability DOES look like a ton of fun to play. :)
Sentry Gwynn, however, seems absolutely ABSURD. She might as well be Lady Jaina Proudmoore, since it keeps your hero from dying if you are playing a healing class such as priest (excluding paladin- they have more than enough ways to defend themselves it seems). Your opponent is forced to attack into it, and your prevention/healing effects could keep her from dying for a long time. That, or you just keep recurring her via AM-E, Resurrection, etc. This is definitely a watch card in future tournaments.
-Mike Rosenberg
-Former Star City writer
-Dropped out of some day 2 big events