Savage Combatant could be really great. A 3 damage hero power is pretty crazy. If druid gets a few more beasts and good inspire cards, they could come out of the expansion with a new deck. They need a type of beast only card draw to really make the deck different from all the Ramp variants. It could happen though.
I really like Flame Juggler. The rng sucks, but it's better than nothing. Shaman, Priest, and Paladin don't have a way to ping for 1 damage, which is incredibly valuable. This ping comes with a good body for it's cost. Even with the coin flip to hit face, I think the card offers enough utility to be used in several mid-range decks.
Clockwork Knight is a really good card stat wise. It could be great in a slower mech deck, which isn't seen much. I remember being really surprised that Mech Yeti was in so many mech decks, so it's possible for stats+synergy to earn a card a deck slot.
I think it could replace a 1 drop in any mech deck, for a more mid-range style of play.
It could replace Fell Reaver in any mech deck, especially when BGH gets really popular.