Portent of Betrayal is a common Sorcery card from Theros (THS), collector number 133. Current market price: $0.03 (foil $0.20), TCGplayer market prices via Scryfall.
Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)