Omnath, Locus of Rebirth

{g}{u}, Return a land you control to its owner's
hand: Create a 3/3 Green Elemental Creature
token.
{g}{r}, discard a land card: Draw a card.
{g}{b}, sacrifice a land: Return target creature card
with converted mana cost less than the number of
lands you control from your graveyard to the battlefield.