Murmuring Bosk is a rare Land — Forest card from Morningtide (MOR), collector number 147. Current market price: $1.52 (foil $16.68), TCGplayer market prices via Scryfall.
({T}: Add {G}.) As this land enters, you may reveal a Treefolk card from your hand. If you don't, this land enters tapped. {T}: Add {W} or {B}. This land deals 1 damage to you.