My rainbow deck, which is somewhat like CCYB (but better IMO :p) uses sanctuary; it's a very nice card, and a must against Dark Matter, and helps a lot with Decay, plus it's like SoG #7. Improved Miracle isn't a bad choice either for light, but I find that my deck is most likely to lose in the first few turns, and usually before I have 12
:; if my game drags out, I've usually won anyway. I don't use any death/darkness in it, so I have no suggestions there.
Depending on your quanta usage, I have found Steam Machine to be an acceptable substitute for Lava Destroyer. It starts off slower than the destroyer, but after about turn 8 or so (I counted it out but forget now) it is better. The Machine also doesn't bend over to stuff like Fire Shield or cheap removal like shockwave. Sometimes the AI will waste a ton of cards killing one Steam Machine. I've seen it use 4 shockwaves to kill one, for instance. (it had an arctic octopus in play too lol but didn't use it)
Actually, I'll just show you my current list. If you don't have the nymphs, I was using a second pandemonium and an improved antimatter before I got them.
Hover over cards for details, click for permalink
500 500 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6qq 6rn 6rn 6rn 6rn 6rn 6rn 6u9 749 749 74b 74b 77f 77f 77i 77i 77i 7gp 7gp 7h2 7h2 7k6 7k6 7k6 7n3 7n3 7q5 7q5 7q5 7q5 7q5 7q5 80a 80a 80h 80h 8ps