Legendary lands are indeed legendary permanents, so Gold-Forged Thopteryx, Gandalf the White, and Yoshimaru, Ever Faithful each recognize this list of lands and reap the benefits
Kuribee X DARK Level 1 [ FiendEffect ] ATK 300 DEF 200 (This card is always treated as a "Kuriboh" card.) When this card, or another "Kuriboh" monster, you control is destroyed by battle: You can add 1 Spell/Trap from your Deck to your hand that lists the card "Kuriboh" in its text
Is Spider-Gwen, Free Spirit legal to play
Such cards do not need to be protected by a card sleeve, as they can be easily replaced by purchasing a new set from the store
From setting up graveyard-based strategies to filtering away excess lands, looting is a versatile mechanic many decks happily employ
If you draw them later in the game, they're essentially dead cards that won't provide any value to you or power to your board