Ultimate Crystal Magic →Used Deck

Comprehensive evaluation: Substantial "Rainbow Overdragon" only.
Activated when Crystal Beast is destroyed in battle, it can be deployed after fertilizing GY.
However, the difficulty is that it is a battle destruction trigger, and if the opponent tries to destroy the effect, it will lose the activation timing and it will be difficult to fill the Spell & Trap zone.
If you use it, it will be null in the form of activating it from a suicide attack and aiming for a follow-up attack.
However, in that case, it is easy to deploy with other jewel support, and it tends to be slow.
However, his overwhelming GY fertilizer is attractive, and since there are a certain number of opponents who destroy the Crystal Beast in battle, it can be used somewhat even if it is slow.

If you can activate this, you should be able to get a rainbow dragon faster and more reliably by playing solitaire with other cards.
Fan Deck is overkill and there is no use for it

I think the effect of (1) is essential for fusion summoning ``Ultimate Jewel God Rainbow Over Dragon'', which has a very heavy fusion material.
With the effect of (2), if the "Ultimate Jewel God" monster is removed, he can place as many GY's "Crystal Beast" monsters as his Continuous Spell, which I think is a strength.

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.

If it is required to be destroyed in battle, I would like a reward as flashy as this.
The conditions are slow and unstable, but in addition to a large amount of his GY fertilizer that fulfills the conditions for summoning a rainbow dragon with this one, you can summon an overdragon treated as a fusion summon (can use deck bounce).
The effect of 2 doesn't make a lot of sense on its own, but will it be a stepping stone for turning back?
The drawback is that you have to put in the activation conditions and 7 types of Crystal Beasts as mentioned above. Even with Crystal Beast, the practicality is limited, so it's difficult to use multiple copies of all 7 types, and on the other hand, there is a risk that this card itself will rot if it is pinned.
It's difficult to handle, but I wonder if the return is worth it.

A trap card that is a great power for the Crystal Beast centered on the Ultimate Gem God.
When a Crystal Beast is destroyed in battle, send 7 types of Crystal Beast from your hand, field, or Deck to GY to summon the Rainbow Overdragon, and when the Ultimate Jewel God leaves the field due to the opponent's effect, GY's Crystal It has the effect of turning any number of Beasts into jewels.
In addition to simply being a powerful card, Rainbow Over is an extremely high-quality support for the Ultimate Jewel God, as the 7 types of jewels are available in his GY as a trigger condition, so the Rainbow Dragon summoning conditions are also met. However, the trigger is his Crystal Beast's combat destruction and is somewhat passive. Is there a danger that Crystal Beast will become vulnerable to removal since Trap is rare?
Although it is quite large, the power of the Ultimate Jewel God is still a great power of his Crystal Beast. Will this be all I like...?

By sending 7 types of Crystal Beasts from his hand, deck, and field to his GY, a trap card that can special summon the ultimate jewel god Fusion Monster as a fusion summon.
The Ultimate Gem God Fusion Monster currently only exists as a Rainbow Over Dragon, so it is effectively a fusion method exclusively for it. It's not likely that there will be more in the future.
Being able to procure fusion materials from the Deck is powerful, but it is weak against removal because it can only be activated when his own Crystal Beast is destroyed in battle. Also, since 7 types of Crystal Beasts are required, all Crystal Beasts must be adopted for this card during the construction stage, and if even one is missing, it will rot at that point.
If the Ultimate Jewel God leaves the field due to the opponent's effect, it also has the effect of reviving the jewel from GY. Ultimate Jewel God is 4000 on its own and is extremely strong in battle, so there will be many cases where it will be removed by its effect. If he used the effect of (1), he should have enough Crystal Beast in GY. A card that is strong as long as it can be activated, but also has various peculiarities.

When the Crystal Beast is destroyed in battle, he can send 7 types of Crystal Beast to his GY to create the ultimate Gem God Fusion Monster. 《Rainbow Bridge》is easy to search.
It can also be sent to his GY from the Deck, fulfilling the conditions for summoning the Rainbow Dragon.
Even after that, if the Ultimate Jewel God is removed by the opponent, his Crystal Beast can be placed in his Spell/Trap zone with the GY effect, so the activation conditions for Contracts and Guidance can be fulfilled.
Essential for getting Rainbow Over Dragons out.

Is it basically going to be a self-destruct suicide attack and over?
It's a passive effect, but I think he's strong because he can fertilize GY and satisfy the conditions for summoning the original Nigoryu.
I wonder if the person below has forgotten the summoning conditions of the original rainbow dragon or is it a jewel airp?

A card with 4000 hit points from this one card is quite strong, but you need to put all 7 types of Crystal Beasts in your Deck.
If you put in 7 different types, you should be prepared to end up with 2 cards in your hand if you lose 1 card in most cases.
Furthermore, it hurts that 7 types of Crystal Beasts are sent to his GY when used once.
The 2nd effect partially compensates for that, but no matter how hard you try, you can only return up to 5 cards, so if you pin it, it will be difficult to activate the 2nd card, and basically all 5 cards. If you line up the Spell / Trap cards on the field, you will not be able to use Spell / Trap cards, and it is unlikely that all Spell / Trap card zones will be empty due to the progress of the duel, so even if you can return only 3 cards at most. If the 2nd effect isn't dependent on the opponent, it's a disappointing effect because it can be used from the 2nd overall reset of 《Rainbow Overdragon》, and it doesn't mesh well...
Overall, both 1 and 2 are powerful effects, but due to the activation conditions and unexpectedly poor engagement, I think you'll feel like you're out of reach when you try to use it.

Jewel Trap Card.
At the time of battle destruction, it has the effect of sending 7 types of Crystal Beast cards to GY and special summoning the ultimate jewel god Fusion Monster as a fusion summon.
When inserting this card, rather than being able to activate its effect only when it is destroyed by battle, the point is that you must first put 7 types of Crystal Beast monsters in your Deck.
If you put only one card in your hand, or if you go to his GY first, the former will be a disadd and the latter will not be able to use the effect.
Therefore, the introduction of this card will be based on the rainbow dragon type rather than the flood type that many people wanted.
A rainbow dragon remake card was also released, but I appreciate the ability to use the remake card and the remake source at the same time.

I think it's amazing that you can hit 4000 points with this one piece. Even if the Rainbow Dragon is eliminated, he is also strong in placing gems from GY.

The activation condition is passive in battle, but since you can fertilize his GY with jewel monsters at a cost, his special summon of the original rainbow dragon is easy.
If you decide well, you can get a 4000 direct from a sweep.
You can't underestimate the recovery effect of starting GY.