Jadelight Spelunker (Extended Art) (Buy-A-Box) [The Lost Caverns of Ixalan Promos]

When Jadelight Spelunker enters the battlefield, it explores X times. (To have it explore, 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 or put it into your graveyard.)