Shaper Pashona, the Reclaimer

Whenever a merfolk enters the battlefield, it explores. (Reveal the top card of its controller's library. Its controller puts that card into their hand
if it's a land. Otherwise, put a +1/+1 counter on that creature, then its controller puts the card back on top
or into their graveyard.)
{g}: Target player scry 1. Only activate this ability once each turn.