Re: What are the best and worst cards?
Currently my best cards are Pepper MD and Second best Taco. The make quite the combo. Add the venus Flytrap and you've got a theme. I was also lucky enough to get a couple of Potted Powerhouse (plant that gets bigger if its in your hand when something grows) so that also combos with Pepper MD gettng bigger from gaining life. So then I added some Grow-Shrooms and Plant food to make that stronger. A couple of cards that are great on their own but also very synergistic in this deck are Power Flower (gains life at the beggining of the turn to aid Pepper MD), Morning Glory (gets +1/+1 if you had 6 or more sun when you played it) to aid Pottered Powerhouse and the truly amazing Black Eyed Pea (a staple in any Mega-grow class) that gets bigger when zombies play tricks.
Well, looks like I just described a whole deck. See, the thing is, there are lots of really solid cards and cards that combo, so its very hard to pick favorites.