Hashep Oasis is a uncommon Land — Desert card from Hour of Devastation (HOU), collector number 177. Current market price: $0.19 (foil $0.82), TCGplayer market prices via Scryfall.
{T}: Add {C}. {T}, Pay 1 life: Add {G}. {1}{G}{G}, {T}, Sacrifice a Desert: Target creature gets +3/+3 until end of turn. Activate only as a sorcery.