at the beginning of combat on your turn, each merfolk 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 the exploring creature, then put the card back or put it into your graveyard.)
whenever hakbal of the surging soul attacks, you may put a land card from your hand onto the battlefield. if you don't, draw a card.