I'll probably be using this deck for my match against dark, although it might change:
5lc 5lc 5lc 5lc 5lk 5lk 5oc 5oc 5oc 5oc 5oc 5oc 5oc 5oc 5oc 5oc 5oc 5oc 5of 5of 5of 5of 5ok 5ok 5ok 5ok 5ok 5ok 5on 5on
Alright, I think this is going to be the deck I use. I'm still messing around with it though.
This deck beats dark almost every time. Holy Lights kill his creatures, Hope + 2 or 3 fireflies provides defense. Dragons are the main source of damage, + the fireflies. Shockwaves are in for extra creature control, although I'd prefer 2 more holy lights over them.