I don't think increasing every 0 cost card to 1 is that great of an idea. For something like Prep then you're cutting its effeciency in half. For Conceal, I could see that being "OK" but at the same time, it was originally 1 cost and changed to 0 when it was nerfed from perma stealth to stealth for just one turn. I personally could see Concea being 1 mana cost and still seeing it played, but I feel that a lot of peoples beef with conceal isn't that it's free, it's that it protects something that's going to kill them next turn when usually it wouldn't because they'd have a turn to react to it. I don't think increasing cost across the board is the right change.
Now for backstab, 1 mana for 2 damage, sounds alright. I would think that if we made its mana cost 1 then what we can do to make it not require a rogue to take an extra turn everytime they'd use it to combo without having that extra mana on their combo card could be like this:
Deal 2 Damage to Target minion, the next card you play that can combo this card costs 1 less.
That way rogues can't use the 0 mana efficiency UNLESS they're playing a Rogue card, and not just ANY rogue card, but one that has a the word "Combo" on it. That way we still see a bit of a nerf to the mana cost of the card, but it doesn't totally break the gameplay it was really intended to assist.
Shadowstep...Oh shadowstep...Returning a card to your hand and reducing the cost by 2. I think that's fine as is but it needs to add "Can't reduce cost to less than (1)"
Prep I think is fine as is, If we increased the cost the reduction cost on it would need to be increased to match it, as that stands, it's not terribly broken since it only counts towards spells, and we don't have many spells to begin that are above 2.
Conceal, I agree I think I could see that going to 1 mana cost again, I think it would rarely see play then which is sad, because all these decks that incorporate those last 2 0 cost cards are gimmick decks, hell one of them is nick named the rogue "miracle" deck. Rather than saying they should be nerfed I think people just need to learn how to play better against it.
For those of you having SERIOUS problems with rogue decks, I would love to see your decklist that you're running so we could help provide feedback on how to play that type of deck against the Miracle deck, or Headcrack deck, what have you.
I honestly think the people "struggling" the win against these "OP" decks are probably ones that just don't have a great strategy on how to beat them, and or just don't have very well constructed decks.
Edited by Hemo on 9/5/2013 6:58 AM PDT