Warden, Motherly Soul

{w}, discard a card: Put a +1/+1 counter on target
land. It becomes a 0/0 creature that's still a land.
{u}, discard a land card: scry 1, then draw a card.
{b}: return target land card from your graveyard
to your hand.
{g}: search your library for a land card and put
it into your graveyard, then shuffle.