7 "Crystal Beast" monsters (This card is always treated as an "Ultimate Crystal" card.) Must be either Fusion Summoned, or Special Summoned by Tributing 1 Level 10 "Ultimate Crystal" monster (in which case you do not use "Polymerization"). Once per turn: You can banish 1 "Crystal Beast" monster from your GY; this card gains ATK equal to the banished monster's, until the end of this turn. (Quick Effect): You can Tribute this Fusion Summoned card; shuffle all cards on the field into the Deck.
How to get / Rarity
This card has one of the best artwork in Yu-Gi-Oh, too bad its effect is shit
If we have shadow mist, rainbow neos only need vyon + rainbow dragon to summon. Summon vyon, send shadow mist to grave, add neos with shadow mist's effect, use vyon's effect to banish shadow mist to add a poly, now you have both poly and neos in your hand + vyon in field for rainbow neos' effect to shuffle your opponent's monster.
This method is far easier than having a CB on the field, setting ultimate rainbow magic and then waiting your opponent to destroy your CB BY BATTLE. With all the destruction and banishing effect in the current meta, it is really hard to pull off, and the monster you are summoning is not even worth the effort.
Unless you Fusion Summon this card, you can't use its last effect, turning it into just a big beater. And who the heck wants to use the last effect anyway, after all the trouble to summon this thing? The last effect removes it from the field.....
Which means a huge beater is all people gonna use this card for. And it's nice to see Konami still hasn't learn that hard to summon big beaters like this one needs to be worth it to summon -_-
This thing is a huge sitting duck against various card effect.....
Also, you would use this card's effect during your turn, not opponent's turn.
The perfect play with this thing is to let a CB gets destroyed in battle during opp's turn, activate "Ultimate Crystal Magic" to Fusion Summon this thing, then on your next turn, nuke the field and summon the basic Rainbow Dragon, now that you have 7 different CB in the graveyard. Then OTK the opponent.