Borderland Explorer is a common Creature — Elf Scout card from Conspiracy: Take the Crown (CN2), collector number 61. Current market price: $0.24 (foil $0.25), TCGplayer market prices via Scryfall.
When this creature enters, each player may discard a card. Each player who discarded a card this way may search their library for a basic land card, reveal it, put it into their hand, then shuffle.