Decorum Dissertation is a mythic Sorcery — Lesson card from Secrets of Strixhaven Promos (PSOS), collector number 78p. Current market price: $8.58 (foil $13.28), TCGplayer market prices via Scryfall.
Target player draws two cards and loses 2 life. Paradigm (Then exile this spell. After you first resolve a spell with this name, you may cast a copy of it from exile without paying its mana cost at the beginning of each of your first main phases.)