"Reign-Beaux, Overking of Dark World" Rating Score by けやぐ

If you discard it, search for a Dark World of level 5 or higher, and if you're in GY, return a Dark World of level 7 or lower to your hand and Special Summon. There is no reason to be weak! It's you who died from overwork.
By saying Dark World of level 5 or higher, 《Grapha, Dragon Lord of Dark World》is the first candidate, and Dark World of level 5 to level 7 is searched. This part depends on the builder, but in fact, this card itself can be returned to the hand with the effect of GY's 《Grapha, Dragon Lord of Dark World》!
Due to its exceptional effect, the search can't catch up with 3 stacks, and even if you throw it away, there may be no Grapha on the Deck.
So, personally, I think 2 is just right.
Return it to your hand and discard it to search for Grapha. Then fuse Grapha, Dragon Overlord of Dark World and discard Demon King Rain from your opponent's turn. Here, "Snoww, Unlight of Dark World" is fine, but the search destination is "Reign-Beaux, Overlord of Dark World", which makes it possible to use a disgusting tactic to scare the opponent.
If it's Snow, is it better to search for Demon King Rain?
Then, with Dragon King Grapha's effect, if you discard Demon King Rein, search for Demon Rein from the Deck. Since it is treated as an effect discarded by the opponent, if you Special Summon 《Ceruli, Guru of Dark World》from Deck GY to your opponent's field and discard Genie Rain, you can wipe out your opponent's monsters.
If 《Raigeki》is decided on this opponent's turn, it will be very pleasant.
It's a card that you can't help but say that it's a card that strengthens Rain!