Nomad Stadium is a uncommon Land card from Odyssey (ODY), collector number 322. Current market price: $0.44 (foil $8.24), TCGplayer market prices via Scryfall.
{T}: Add {W}. This land deals 1 damage to you. Threshold — {W}, {T}, Sacrifice this land: You gain 4 life. Activate only if there are seven or more cards in your graveyard.