Mistveil Plains is a uncommon Land — Plains card from Shadowmoor (SHM), collector number 275. Current market price: $1.26 (foil $14.39), TCGplayer market prices via Scryfall.
({T}: Add {W}.) This land enters tapped. {W}, {T}: Put target card from your graveyard on the bottom of your library. Activate only if you control two or more white permanents.