"The Forge: Build a deck by selecting one card from each of a series of randomized card choices, and then play against other Forge participants. The cards you pick to build your deck are yours to keep—play well enough, and you could win even more. Note that you must trade in a certain number of card packs to participate in The Forge (further details to be announced later)."
So, you will need to win games in Play Mode in order to be able to "buy" your way in to The Forge. However, getting to keep the cards you pick sounds like it will be worth it. Still don't like the fact everything comes down to absolutely needing to play other players to earn anything in the game.
"Practice Mode: Play against A.I. opponents representing different classes to unlock new heroes and basic cards."
Well, I guess that works ok. I don't know what "basic" cards means though.
Oh no, that's what I meant. I meant that the entire point of the game hinges on playing other players. You can't earn any cards, any booster packs without it. I just hope the matchmaking system works, because if not, it's going to cause some havoc.