Sweet Oblivion is a uncommon Sorcery card from Theros Beyond Death (THB), collector number 70. Current market price: $0.16 (foil $0.26), TCGplayer market prices via Scryfall.
Target player mills four cards. Escape—{3}{U}, Exile four other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)