Urza's Cave is a uncommon Land — Urza's Cave card from Modern Horizons 3 (MH3), collector number 234. Current market price: $2.50 (foil $3.31), TCGplayer market prices via Scryfall.
{T}: Add {C}. {3}, {T}, Sacrifice this land: Search your library for a land card, put it onto the battlefield tapped, then shuffle.