Thought Erasure is a uncommon Sorcery card from Guilds of Ravnica (GRN), collector number 206. Current market price: $0.29 (foil $0.25), TCGplayer market prices via Scryfall.
Target opponent reveals their hand. You choose a nonland card from it. That player discards that card. Surveil 1. (Look at the top card of your library. You may put it into your graveyard.)