Endless Horizons is a rare Enchantment card from Eventide (EVE), collector number 4. Current market price: $8.05 (foil $28.53), TCGplayer market prices via Scryfall.
When this enchantment enters, search your library for any number of Plains cards, exile them, then shuffle. At the beginning of your upkeep, you may put a card you own exiled with this enchantment into your hand.