"GY Hogyoku" Deck 2018

Playing

If you have "Magical Merchant" and "Book of Taiyou" in your initial hand, you can easily put out "Rainbow Dragon" on the first turn (hopefully...)
*2018/03/31 postscript
If you have "Magical Merchant", "AD Changer" and "Quickdraw Synchron" in your initial hand, you can easily get "Rainbow Dragon" on the first turn (hopefully...)

Strength

Drop a large number of "Crystal Beast" monsters into his GY with "Magical Merchant" and issue "Rainbow Dragon". It is also possible to salvage the 《Rainbow Dragon》that fell to GY by making 《Herald of Pure Light》with 《Plaguespreader Zombie》and 《Quillbolt Hedgehog》. If you accidentally create two Special Summons with Rainbow Dragon, you can also get Rank 10 Xyz Monsters such as Superdreadnought Rail Cannon Gustav Max, No.35 Labenos Tarantula, and No.81 Super Dreadnought Turret Train Superior Dora. . 《Rainbow Dragon》x 2 + 《Superdreadnought Rail Cannon Gustav Max》totaling 10000 damage is very attractive (albeit a pipe dream).
…《Rainbow Overdragon》? 　When only one 《Rainbow Dragon》can be put out, it can only be used to reset the board.
*2018/03/31 postscript
"Magical Merchant" reverse method changed to "AD Changer". Book of Taiyou is too limited in utility to be the only Spell/Trap card in the Deck and doesn't work after bringing it in with Magical Merchant. 《Card Destruction》and 《The Melody of Awakening Dragon》entered instead. 《Card Destruction》can mulligan (re-draw) even if it is in your initial hand if the contents are bad, and you can drop 《AD Changer》and “Crystal Beast”, which you probably have in your hand in large quantities, to GY. Even after searching with 《Magical Merchant》, you can drop "Crystal Beast" from your hand when "1 or 2 more gems are left until GY completes", which is convenient. 《The Melody of Awakening Dragon》will of course be used to search for 《Rainbow Dragon》, but (if the GY Fertilizer is going well) it is also realistic to have two 《Rainbow Dragon》Special Summon. In addition, "Quickdraw Synchron" is used as a means of sending "AD Changer" to his GY. By synchronizing with the face-up 《Magical Merchant》and becoming 《Drill Warrior》, it can be used as an Xyz material in his GY during the standby phase of the next turn while leaving the EX monster zone with its own effect. You can return to the main monster zone while salvaging the fallen 《Rainbow Dragon》. The salvaged 《Rainbow Dragon》will be able to Special Summon again unless there is a serious problem, so let's attack it in waves.
※2018/04/03
"No.20 Ant Rock Soil Brilliant" and "No.70 Deadly Sin" were adopted as Rank 3 and Rank 4 monsters to make the most of the "Crystal Beast" monsters, which have many Level 3 and Level 4 monsters. By stacking 《Digital Bug Corebage》all at once without using effects, you can send both of the “Crystal Beast” monsters that were Xyz materials to his GY. From there, by connecting 《No.21 Frozen Lady Justice》→ 《Gaia Dragon, the Thunder Charger》, you can prepare 2600 RBI (Defense Penetration) while wiping out his opponent's Defense Position monsters.
"Crystron Halqifibrax" was used because "Herald of Pure Light", which had fulfilled its role, remained in the EX monster zone. If you activate the effect of "Herald of Pure Light" with "Plaguespreader Zombie", you can Special Summon "Plaguespreader Zombie" again, so you can fulfill the link summon condition of "Crystron Halqifibrax" of "2 monsters including 1 or more tuners". here
① 《Plaguespreader Zombie》remains in GY or Deck
② GY has 《Quillbolt Hedgehog》
③ There is a level 4 monster on your field
If these conditions are met, 《Plaguespreader Zombie》can be used to Special Summon 《Plaguespreader Zombie》from Deck with the effect of 《Plaguespreader Zombie》or 《Crystron Halqifibrax》. → Synchro summon "Old Entity Cthugua" with "Plaguespreader Zombie" and "Quillbolt Hedgehog" to bounce all rank 4 monsters (basically opponent only) → Xyz summon "No.70 Deadly Sin" with level 4 monsters and "Old Entity Cthugua" While doing so, it is possible to draw 1 → 《Digital Bug Corebage》→ 《No.21 Frozen Lady Justice》→ 《Gaia Dragon, the Thunder Charger》. If you don't have ③, you can Synchro Summon "Armory Arm" instead of "Old Entity Cthugua" to strengthen your army.

Weakness

If 《Magical Merchant》doesn't come to your hand or if his GY fertilization doesn't work, it will be very painful (try your own destiny). In addition, since it has not introduced the abundant support cards of "Crystal Beast" (the turn it is played is almost vanilla), you can only fight with one-point breakthroughs such as "Rainbow Dragon".

Customize

"Crystal Beast" monsters, especially "Crystal Beast Sapphire Pegasus" that you want to summon, are level 4 across the board, so rank 4 Xyz Monster can also be used. I wonder if 《Lavalval Chain》will come back...