Naga Oracle is a common Creature — Snake Cleric card from Amonkhet (AKH), collector number 62. Current market price: $0.09 (foil $0.35), TCGplayer market prices via Scryfall.
When this creature enters, surveil 3. (Look at the top three cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)