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You can also enter players' cups to compete with other players around the globe

400-Card Capacity Spacious enough for full sets, multiple decks, or your rarest pulls

The fact that it is a searcher helps as well, especially since it isn't limited to monsters

Dark Machine Dragon Deck (New Recruitment) 2017-11-08 Pure Kozmo 2018-09-28 Desperado [DARK Machine] 2019-08-23 Rank 4 axis back Cyber 2019-10-13 Orpheus Kozmo of Steel 2020-11-21 Honorary Tengen (Kill your opponent with a coin toss!) 2021-10-05 Big, hard, and shiny

Because of their limited supply, their rarity shot up over time, and naturally, so did the demand among collectors