I find that jungo and junks work well, jungo boost the high life you get through winning making it hard to catch up and junks have cards like gil,rowdy,tremorh and gibson which you can save your pills for jungo so those clans work best for me, what clans work for you?
Pussycats, Sakrohm and Roots are very strong in ELO Survivor because they have high power and a good supporting bonus, and are very flexible. Cards can block, defend or attack in most cases (Murray, Muze, Yookie etc.)
Of course Rescue with their bonus and they are the main clan used for 15 wins+. But it can be done with many others also.
Sakrohm and Roots would to surprisingly good at preserving health. Imagine a hand like Yookie, Lou, Jeena and Uranus :O
Piranas and Junks will do good for preserving pillz, although Piranas would do alot better at that in a Mono Deck. Like, in a mono deck, Scubb, Dahlia/Selma, Smokey and Hawkins, or in a half deck, Smokey, Selma/Dahlia, Tremorh and Gil