Ok budget deck.
In ELO its a good idea to try to remember that you don't have to ko the opponent, because sometimes you might think "with fury i can ko the opponent" but unless your 100% sure your card can't be beaten/ you will be koed if you don't win by ko now, then its a good idea to not ko them but lower there life points low enuth to win.
Also don't rush your moves. You don't get extra points for winning quickly in ELO.
Cant really comment on the Berzerk part since im not that familiar with the clan. But as far as Piranas go...
Kristin's fine. A terribly underrated card if u ask me. Hector is totally worth his money as well. The two that are really unimpressive are Andsom and Goldie IMO. And since u're on a budget... I'd suggest going for Hawkins Noel + Sting instead. That Hawkins Noel guy is dirt cheap and is actually a fantastic little card. To be completely honest, i dont think that single pill manipulation feels at home in this deck, but Andsom did the same trick anyway so its all for the better. Sting clearly isn't my favourite 4* option here but it's the best u can get for a reasonable sum of clintz.
That brings us to two courage-based cards and one with confidence which you clearly dont want to ocasionally draw together. Could solve that by replacing Gus with Revok who appears much more versatile and also quite SOA-independent which is something u should always take in consideration when building ELO-deck.
Well, thats just my two cents worth. Hope it helps.
I would advise buying Revok if you can. He is less than 1k clintz right now and, in my opinion, is a great card.
I would also recommend replacing Goldie, like everyone else has mentioned. She is clearly the deck's worst card.
Perhaps a good upgrade would be:
Goldie -> Hawkins Noel
Norman -> Revok
The deck already looks reasonably decent, though. I would imagine you will be able to do somewhat decently with it just as it is.
Dont even bother getting Noel, that card is not worth it, rather get another fullstop like Spycee, it helps greatly with the +Life cards, - pillz and poison. Most of the time people never expect it to hit so you can win a fight with 3 pills.
People often stress out when they see Andsom, but it easly gets beaten, might change it to a 4 star card, like Katan, but then you would need to leave your berserk deck like it is.
Would also change Norman to Revok. If you dont get another 4star Pira