Atris, Oracle of Half-Truths is a rare Legendary Creature — Human Advisor card from Theros Beyond Death Promos (PTHB), collector number 209p. Current market price: $0.40 (foil $0.40), TCGplayer market prices via Scryfall.
Menace When Atris enters, target opponent looks at the top three cards of your library and separates them into a face-down pile and a face-up pile. Put one pile into your hand and the other into your graveyard.