Underground Skygazing

{t}: Add {c}.
{2}, {t}: Look at the top three cards of your
library, then put one into your hand and
the rest on the bottom of your library in
any order. You may reveal a land card from
your hand. If you do, draw a card.
{4}, {t}: Put a land card from your hand onto
the battlefield tapped. If that land is a Cave,
create a 1/1 white Adventurer creature token
with "{t}: Add {c}."