Necroblossom Snarl is a rare Land card from Strixhaven: School of Mages Promos (PSTX), collector number 269p. Current market price: $0.34 (foil $2.71), TCGplayer market prices via Scryfall.
As this land enters, you may reveal a Swamp or Forest card from your hand. If you don't, this land enters tapped. {T}: Add {B} or {G}.