Dream Eater is a mythic Creature — Nightmare Sphinx card from Guilds of Ravnica (GRN), collector number 38. Current market price: $0.49 (foil $1.10), TCGplayer market prices via Scryfall.
Flash Flying When this creature enters, surveil 4. When you do, you may return target nonland permanent an opponent controls to its owner's hand. (To surveil 4, look at the top four cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)