We are trying to mix the Ultimate Crystal Rainbow Dragon Overdrive turbo playstyle with Crystal Conclave control with extra options on the sideboard to bolster either of the playstyles if needed.
Control the early turns with Crystal Conclave , using it to bounce your opponent's cards on key moments to prevent them from doing their plays efficiently and finish them off with a variety of options, like Rainbow Dragon and its fusions Ultimate Crystal Rainbow Dragon Overdrive and Rainbow Overdragon, Number S39: Utopia the Lightning or Crystal Beast Ruby Carbuncle 's abiility to flood the field( you need minimum 2 Crystal Beast Rainbow Dragon , 1 Crystal Beast Sapphire Pegasus and Crystal Beast Ruby Carbuncle for 8100 points of damage).
Main Deck
We are playing one of each of the crystal beasts here mainly for the ability to summon Rainbow Dragon and its fusions, also they can become fodder for your crystal spell/traps.
Advanced Crystal Beast Sapphire Pegasus is played as a full playset cause its our only normal summon Crystal Beast that is worth the normal summon , it fetches us another crystal beast on summon and it can act as a one body Rank4 if you fetch Crystal Beast Rainbow Dragon and use its effect.
Crystal Beast Rainbow Dragon is used at 2 since it is kind of brick as the other crystal beasts but it can be more easily used and has a usefull effect from the spell/trap zone.
Crystal Master is used to boost our consistency a bit with its ability to tribute itself to get you a crystal card, although it uses our normal summon , we dont have much use for it beside Crystal Beast Sapphire Pegasus .
Rainbow Dragon is just a one off as the other Crystal Beasts since its a brick , but we enjoy having it on hand to use for Awakening of the Crystal Ultimates .
Rainbow Bridge is a non once per turn searcher for our Crystall spell/traps.
Rainbow Bridge of the Heart is a once per turn searcher for our Crystal spell/traps, on top of giving us an extra normal summon , and bouncing opposing cards , is the best card at the deck doing everything you need it to do.
Awakening of the Crystal Ultimates is mostly our way to bridge from Crystal Master or Rainbow Bridge to Rainbow Bridge of Salvation but it also has a nice alternative use of special summoning a Crystal Beast from anywherew beside banishment , and in the situation where you have Rainbow Dragon in hand , you can use both effects.
Crystal Bond is steroids Pot of Greed for Crystal Beasts since it goes +2 on cast and can get you 2 names to get closer to Ultimate Crystal Rainbow Dragon Overdrive summon.
Pot of Extravagance is here to boost out concistency because around 1/4th of the deck is Bricks and most of our Extra Deck will not be used anyways.
2 of Crystal Conclave and one of Crystal Miracle to use as a package for control playstyle early and one Ultimate Crystal Magic if you find a situation to use , like crashing a Crystal Beast.
3 Ash Blossom & Joyous Spring 3 Infinite Impermanence and 2 Nibiru, the Primal Being as our handtraps.
Extra Deck
3 of everything to avoid getting banished by Pot of Extravagance
Rainbow Overdragon and Ultimate Crystal Rainbow Dragon Overdrive as our wincon , if you use Ultimate Crystal Magic to summon Rainbow Overdragon you can use it to wipe the field , and then on your turn you can summon Ultimate Crystal Rainbow Dragon Overdrive to go for game.
Number 39: Utopia and Number S39: Utopia the Lightning is used as a budget option to make Crystal Beast Sapphire Pegasus into something that cna push for win on its own on a chipped off enemy.
Lightning Chidori is used as a Rank4 option to help break opposing fields.
Side Deck
Dimension Shifter is used to punish graveyard decks since it doesnt affect us at all.
Droll & Lock Bird as an extra devastating traps for some decks.
Cosmic Cyclone to deal with problematic spell/traps.
Crystal Abundance is great for closing games but has steep requirments, can be used in longer grind games possibly.
2 extra Ultimate Crystal Magic to make sure you pull it off against unaware opponents, if you search for it via Rainbow Bridge or some other searcher , they know you have it , so they will most likely not trigger it on their own.
2 extra Crystal Miracle because lightning storm makes us go cry in a corner.
Im still not convinced Crystal Raigeki is completely outclassed by Crystal Conclave so i sneaked a copy of it here on the sideboard.