Llanowar Loamspeaker is a rare Creature — Elf Druid card from Dominaria United Promos (PDMU), collector number 170p. Current market price: $1.40 (foil $1.50), TCGplayer market prices via Scryfall.
{T}: Add one mana of any color. {T}: Target land you control becomes a 3/3 Elemental creature with haste until end of turn. It's still a land. Activate only as a sorcery.