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A Dragon collector may care most about Latias, Latios, Flygon, or Black Kyurem

Well, you'll either need to collect the cards from Arena booster packs for the sets they came in, or else directly 'craft' the specific cards you need using MTG Arena Wildcards - effectively tokens you can exchange for the exact Common, Uncommon, Rare, or Mythic Rare card you want, depending on the type of Wildcard

Binder Collection Contents: 5 booster packs of Black Bolt or White Flare and a 9-pocket collector's folder with artwork of Zekrom (Black Bolt) or Reshiram (White Flare)

Last we have instants and sorceries

The more complex ones require specific actions or conditions

The big question, really, is whether Ashcoat will hold its value