The reason why this is important is that theres a card called Dragon Buster Destruction Sword which reads While this card is equipped to a monster, your opponent cannot special summon monsters from the extra deck. As you can imagine, things get unfair quickly when this card is in play
We have a special process to make our sleeve actually warp/bend before they split
Theres an argument that these are better in the 99 than as the commanders of a dragon deck because they offer card advantage when they ETB and fetch the other one from your library
Pay one, sacrifice your 0 drop artifact, look at your top 8 and put two brand new 0 drop artifacts into play
Somewhat unsurprisingly, these copies are significantly more expensive right now, selling for $29.97
Furthermore, both these cards also give players a significant amount of card advantage, which leads them to being played at very high rates