The problem with your deck is that 14 cards cost 5 or more and most of your 2-brain zombies are weak. squirrel, ghost and piper are among the worst 2 drops (well, two of them are okay in Pet decks). Your early game overall is pretty weak since 4 nibble are too many and they dont deal with most threats these days. take out ~4 of your expensive cards too and replace them with some good early game cards.
also your deck doesnt have any synergy. you play gargs & tricks & pets. try to focus on one thing, for example tricks (with some gargs as finishers).
your deck now tries to survive and play gargs, but smash, toastercyborg and boogaloo can do that better, i guess.