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How would you build around cards like Liliana of the Veil and Bottomless Pit

Eevee Heroes is the most valuable modern Japanese set overall, with two cards from this single set appearing in this top 10 plus Glaceon, Leafeon, and other Eeveelutions commanding $600$725 just outside the list

I would definitely overhaul the mana base by adding slow lands, verges, and shock lands, but that would be the case with any precon upgrade

Put any number of permanent cards from among them onto the battlefield and the rest into your hand

They might not help you win a popularity contest, but these cards can punish greedy land bases while doing very little to hinder decks that are built to operate without access to nonbasic lands