Maximum rarity, maximum desirability.
With that in mind, I'd recommend bookmarking the following stores and regularly checking for any new products: Pokmon Center (global) - runs out of stock quickly Amazon (global) Walmart (US) Best Buy (US) Barnes & Noble (US) - in-store only Magic Madhouse (UK) GAME (UK) Chaos Cards (UK) These probably offer your best shot if you're shopping online, though you can sometimes find Pokmon cards at retail prices in person too
With that math in mind, if you want your deck to reliably make 4 land drops in the first 4 turns of the game, you should start with 36-39 lands and tweak from there
Open your Decks tab and then hit the white plus icon to start a new deck
Combat focussed archetypes are relatively few and far between, but hopefully this reprint allows them to be built that bit easier
While not quite as valuable as the Pokmon boosters, the Yu-Gi-Oh