Conspiracy Theorist is a rare Creature — Human Shaman card from Strixhaven: School of Mages Promos (PSTX), collector number 94p. Current market price: $0.67 (foil $1.13), TCGplayer market prices via Scryfall.
Whenever this creature attacks, you may pay {1} and discard a card. If you do, draw a card. Whenever you discard one or more nonland cards, you may exile one of them from your graveyard. If you do, you may cast it this turn.