Sounds good guys

I must admit, I kind of stole the term "realistic" from this classic game called Jagged Alliance 2, it had some setting with two options: Realistic and Sci Fi (the latter setting would include fictitious guns and some alien invasion).
And RobberBaron, yes grab the Plant / Wolf token images here:
http://www.mediafire.com/?45imznutnjkThen just extract it to your /res/pics folder (it should put all images in the icons and tokens subfolders).
If all went well, the in-game images of the wolf and plant should show up, and the Plant Shop should look something like this (check screenshot).
Easy, Medium, Hard and Very Hard are different only with regard to starting card pool, and I think it takes more games to earn cards (in easy/medium, you get a booster every game, hard/very hard it's every other game). As it turns out, Easy starts out with 45 commons, 20 uncommons and 10 rares, everything else 40 commons, 15 uncommons and 10 rares.
Quest length really doesn't matter, in easy mode you reach ranks much quicker and ranks were meant to show progress of the game (a quest would be "finished" after 10 games on easy). But people like to play long ass campaigns of 100+ games, so it really doesn't mean anything (a quest should be as long as you want it to be!)