Scatter Fusion →Used Deck

It's an effect close to a modified version of 《Brilliant Fusion》, and unlike 《Brilliant Fusion》, I think it's excellent that he can put 3 copies in the deck.

His deck fusion card of "Gem-Knight" next to "Brilliant Fusion"
Even if it's not Rock, if you fuse summon it with 1 copy and then fertilize his GY with 2 copies, it will lead to massive expansion and it's powerful.
It shares the activation conditions with Quartz, so you can search for it over there and instantly fusion summon it.
As mentioned above, if you ignore various restrictions, it is a level card that can be called a power card.
However, in reality, due to various restrictions, it is a card that is difficult to adopt easily.
First of all, if there are no monsters on the opponent's field, you can't even activate it. Playing second is almost fine, but otherwise he can't even fuse his hand, which is a big problem with his Deck, "Gem-Knight," which can aim for one kill when going first.
And after activation, general-purpose links such as access codes cannot be Special Summoned, so the ability to respond will be narrowed. However, in this regard, "Gem-Knight" alone can be expanded considerably.
If you want to use it even in advance, would it be better to use it together with 《Black Garden》etc.?
The effect is powerful, so it's a regrettable card.