There are deck-building machines back in the Professors lab that unlock opponents decks, but you need the cards in your inventory for the machines to make said decks
The comparatively high costs of the dragon creature cards can be absorbed well by the high mana count in the deck, further support is provided by the Dragonmaster Outcast, the Dragonspeaker Shaman or the Dragonlords Servant
2021-06-18 Due to a 2021 rules change to cascade, not only do you stop exiling cards if you exile a nonland card with lesser mana value than the spell with cascade, but the resulting spell you cast must also have lesser mana value
Later in the game, you can have a greater toolbox, with different exiled creatures that can provide card draw, bounce, removal, or just size
ONE PIECE CARD GAME The Azure Seas Seven
I mean, even if youre doing nothing crazy, its basically the best part of Sword of Feast and Famine but without needing creatures and without being very interactable