Hakbal of the Surging Soul — The Lost Caverns of Ixalan Commander #19

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 attacks, you may put a land card from your hand onto the battlefield. If you don't, draw a card.