Because it sees rampant play in both Commander and Pioneer, Urborg, Tomb of Yawgmoth tends to go for about $40 in its non-foil version
Unfortunately, you also need 4 of these for Legacy, as it has a unique effect and generates so much mana in the Elves deck

Wilds of Eldraine Collector Booster Box 12 Wilds of Eldraine Collector Boosters 15 Magic: The Gathering cards 5 cards of rarity Rare or higher in every pack 5 Uncommon cards 4 Common cards 1 Full-Art Land 10-12 Traditional Foil cards in every pack At least 3 special Borderless cards per booster 1 Traditional Foil double-sided token Wilds of Eldraine Draft Booster Box 36 Wilds of Eldraine MTG Draft Boosters 15 Magic: The Gathering cards per booster 1 card of rarity Rare or higher in every pack 3-4 Uncommon cards 9 Common cards 1 Land card (Full-Art Land in 33% of boosters) At least 1 special Borderless card of rarity Uncommon or higher Wilds of Eldraine Set Booster Box 30 Wilds of Eldraine Set Boosters 12 Magic: The Gathering cards per booster 1-5 cards of rarity Rare or higher in every pack 1 Art Card 3-7 Uncommon cards 3-6 Common cards 1 Land card At least 1 special Borderless card of rarity Uncommon or higher 1 Traditional Foil card 1 token/ad card, Helper card, or card from "The List" (a special card from Magic's history or Universes Within cardfound in 25% of packs)

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These categories, Staff, World Championship cards, Promos, and Secret Energies, then Holofoils, and finally misprints and Holo energies with extra swirls will take you from the most to the least valuable Pokemon TCG energy cards