Lluwen, Imperfect Naturalist

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 generic mana black or green mana black or green mana black or green mana , tap , Discard a land card: Create a 1/1 black and green Worm creature token for each land card in your graveyard.