Try gravestone/ deadly for zombies and freeze with plants.
Gold league isn't very high up yet. Still easy to get rank. With a few lucky streaks, even not great players get there. So keep that in mind. It means 1. Some players will seem way stronger than others and 2. You're just starting to get into good decks.
As you get more cards, build better decks, start managing your lanes better, playing stronger players and learning about the synergy in comboes; you'll start to see that there is a very good balance to this game. The problem is some of us have paid and some of us haven't, it's early on, the population can't quite handle the disparity in the ranks.
I have very few matches that i cant honestly say that it was either a counter deck to mine, that i got outplayed or that i made a mistake that cost me.