Lluwen, Imperfect Naturalist is a rare Legendary Creature — Elf Druid card from Lorwyn Eclipsed (ECL), collector number 232. Current market price: $0.34 (foil $0.39), TCGplayer market prices via Scryfall.
When Lluwen enters, mill four cards, then you may put a creature or land card from among the milled cards on top of your library. {2}{B/G}{B/G}{B/G}, {T}, Discard a land card: Create a 1/1 black and green Worm creature token for each land card in your graveyard.