When you've played this game long enough, you see why these predictions are always wrong. Breath of Dreams is only a meta defining card if Dragon Druid is a meta-defining deck. Same goes for all the "breath" cards. Hearthstone is full of cards like this that almost nobody has ever used because they were high-powered cards that only fit with low-powered deck archetypes. This set contains cards that seem intended to drive several different dragon decks. One will probably be really good, and the cards that support the rest of them will never see play at all. The likelihood of Breath of Dreams, Candle Breath and Lightning Breath all being good cards is extremely low, because for that to happen all three of these dragon decks have to work.
The same goes for Fate Weaver. If you can build a deck that has room for all the Galakrond mechanics while also having room for whatever combo this card is supposed to power that also has room for the stuff that keeps Priest from being killed by faster, simpler decks, this might work. But if it is not better than the existing Divine Spirit/Inner Fire combo priest decks, people will just play those instead.
Nozdormu is really interesting, because it is a fantastic card for a big Paladin deck, which is an archetype that doesn't currently exist. If you draw Nozdormu, and you play your 8/8 and then get 10 mana crystals to make another big play, you've likely engineered a tempo swing that many opponents won't be able to counter, even with their own mana crystals unlocked. Many aggressive decks need to kill big decks before they get to 10 mana crystals, because they cannot compete card-for-card once the late-game threats start hitting the board. The trouble is, how does the Nozdormu Paladin deck win games where you don't draw Nozdormu? Paladin doesn't have a lot of ways to cheat out big cards, accelerate its mana curve or tutor a big card out of its deck. This card would be insane in Druid. In Paladin, there isn't currently a deck that can take full advantage of what Nozdormu does.