Shefet Dunes is a uncommon Land — Desert card from Hour of Devastation (HOU), collector number 183. Current market price: $0.33 (foil $0.91), TCGplayer market prices via Scryfall.
{T}: Add {C}. {T}, Pay 1 life: Add {W}. {2}{W}{W}, {T}, Sacrifice a Desert: Creatures you control get +1/+1 until end of turn. Activate only as a sorcery.