Llanowar Mentor is a uncommon Creature — Elf Spellshaper card from Future Sight (FUT), collector number 131. Current market price: $0.38 (foil $3.67), TCGplayer market prices via Scryfall.
{G}, {T}, Discard a card: Create a 1/1 green Elf Druid creature token named Llanowar Elves. It has "{T}: Add {G}."