Lushwater Oasis

Lushwater Oasis comes into play tapped.
{t}: Add {r} or {g}.
Whenever a land enters the battlefield under
your control, if you control 4 or more other
lands, you may put a quest counter on
Lushwater Oasis. Then, if you do and it did not
have a quest counter on it, return a creature
card from your graveyard to your hand.