Mono Skeelz /need/ Sasha. Her ability makes her a wall that forces players to second guess the use of their most powerful cards. She's only around 2.4k, so very affordable.
Dr Falkenstein is another very powerful support card, with support: -4 attack. That's a whopping -16! Again, he's under 3k so easy to afford.
I would also consider getting one of the more solid 3* cards for your mid deck. Lorna is great, a card who can turn any clan's ability against themselves. With any power or attack manipulators, she's effectively an SOB. However, against popular clans such as La Junta and Freaks she gets soe added damage potential, which the clan do need.
I'd also consider Snowflake, she helps with the clan's low damage by mitigating your opp's ability to hurt you.
I would consider getting the above cards, then doing something like this: