Frostboil Snarl is a rare Land card from Strixhaven: School of Mages (STX), collector number 265. Current market price: $0.34 (foil $0.46), TCGplayer market prices via Scryfall.
As this land enters, you may reveal an Island or Mountain card from your hand. If you don't, this land enters tapped. {T}: Add {U} or {R}.