Skull Prophet is a uncommon Creature — Human Druid card from Ikoria: Lair of Behemoths (IKO), collector number 206. Current market price: $0.70 (foil $1.71), TCGplayer market prices via Scryfall.
{T}: Add {B} or {G}. {T}: Mill two cards. (Put the top two cards of your library into your graveyard.)