When you use raindows deck, you must have 2,3 or 4 gloden/electrum hourglasses; You can use a weapon bow, but if the oppenent have an Eternity or Some rewinds, it's over, you can use quintessences or Anubis to immortalize your weapons, but you won't have enough weapons, because you can't use mitosis, and fractal are useless.
Dragon bow are maybe porefull, but it's uncheap, they have no skills to use, so i'm not sure it's a good idea to use them.
Basic raindow decks, use creatures with interesting skills like otyugh to swallow opponent's creatures, you can combine it with bone yard, and bone wall. You can use fallen druid to change skelletons to mutations. You can use firefly queens too, they summon fireflies which can be devour by the otyugh if you have nothig to devour for example.
Furballdn's deck idea is an other way with rainbow, combine super nova ans quantum pillars to summon cheap but powerfull creatures. My deck is defensive, his deck is agressive, so you can choose.