Lost Shores

Lost Shores enters the battlefield tapped.
When Lost Shores enters the battlefield,
you may pay {1}. If you do, target creature
you control explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then put the card back on top or into your graveyard.)
{t}: Add {u} to your mana pool.