Vivi saw a pretty significant drop-off after this, falling to $47 just before the June Standard bans
Try to find your favorite combination
While we've had dominant decks and cards like Collected Company, Siege Rhino, Pack Rat, and Rally the Ancestors, those formats didn't see huge drops in attendance, and for the most part, by the time the outcry got loud, the problem card was already close to rotation (if you look at Rally and Bant Company, their most dominant times were in the two or three months before they rotated from the format)
Take a look at these examples to get an idea of what you can find in the expansion
Not only is it a Dragon with more than 4 power, it also has an enters or attacks trigger that gets more potent the more big creatures you have
Interestingly enough, the European copies are already a good deal more expensive than in North America, running around $8-9 for the cheapest copies