Coiling Oracle is a common Creature — Snake Elf Druid card from Duel Decks: Elspeth vs. Kiora (DDO), collector number 51. Current market price: $0.16, TCGplayer market prices via Scryfall.
When this creature enters, reveal the top card of your library. If it's a land card, put it onto the battlefield. Otherwise, put that card into your hand.