GvG Card Reveal: 36 New Cards, Upcoming Balance Changes - News - HearthPwn

Soulfire now costs 1 (up from 0)
Soulfire, along with fast and powerful minions, allowed Warlock rush decks to get ahead on the board and stay ahead. We’ve upped Soulfire’s mana cost by 1 to slow down the Warlock rush deck just a bit and allow more players time to react and interact against the Warlock.

Gadgetzan Auctioneer now costs 6 (up from 5)
Gadgetzan Auctioneer’s ability allows for a player to potentially draw many cards for little cost. Card draw and card advantage are important to the game—overall, games are less interesting when a player draws their entire deck. This change brings Gadgetzan Auctioneer’s cost more in line with its power level.

Flare now costs 2 (up from 1)
Flare allowed the Hunter an advantage versus decks that revolve around Secrets, while also allowing the Hunter to draw a card for little cost. We want to encourage a variety of decks in Hearthstone. With this change, Flare will continue to be useful against decks playing Secrets, but will be weaker against other decks