"Ultimate Crystal Magic" Rating Score by 超弩級スライム

A card that allows you to Fusion Summon 《Rainbow Overdragon》using the battle destruction of “Crystal Beast” as a trigger.
《Rainbow Overdragon》requires as many as 7 materials to fuse normally. Therefore, this card, which can use the Spell & Trap Zone and his Deck's "Crystal Beast" as a cost, is almost essential for fusion summoning it.
If you can Fusion Summon, you can use all Deck Bounce effects on that monster, and his Special Summon condition of 《Rainbow Dragon》will give you a big advantage.
On the other hand, it's a Normal Trap that triggers battle destruction, so it's slow to activate. If you search with 《Rainbow Bridge》, your opponent won't be able to destroy "Crystal Beast" by battle, and it will probably be activated from a suicide bomb attack on your next turn when you're lying down. However, if the opponent has some kind of face-down removal method by then, they should be able to remove it with all their might, so it is not an easy card to activate even if it assumes a suicide attack. On the other hand, if you pull it out, you may be able to activate it without being noticed by your opponent, so if your opponent has a set card, will your opponent be aware of this card?
Also, since there must be at least 7 types of "Crystal Beast", there is a possibility that it can not be activated after the middle stage.
The GY effect is triggered when "Ultimate Jewel God" is removed by the opponent's effect, and puts "Crystal Beast" back into his Spell & Trap zone, and by fulfilling the activation conditions of the support card again, it leads to a comeback. However, if you send it to his GY with your own effect, you can't activate it, so it's better to think of it as a bonus.
Its effect is powerful, but it is difficult to activate, and it cannot be said that it is strong to let go, but its existence itself is a card that puts pressure on the opponent.