I was thinking about card's special abilities (like infused provoke for grinder), most of them should not have an addition cost because, from my point of view, it takes some content away from the game, players wont cast them either because they dont do much or they cost too much or both. So I would rather make some of them free (which are not worth the cost) and maybe tweak the numbers for the other abilities or the cards themselves in order to balanced the cost of the actual card and it's special ability. This could be done before actually balancing the cards 1 by 1 cuz a lot of cards are unbalanced and by that I mean more or less useless.
What do you think?