Kumena's Forerunner

When Kumena's Forerunner enters the battlefield, it 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 this creature, then put the card back or put it into your graveyard.)
Whenever you reveal a merfolk card while exploring, you may put that card into your hand.
"From dense forests to raging rapids, all of Orazca will be ours!"