When River Herald Scout 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.)
Don't worry, little swimmers. I'm here for the ruins, not you.
River Herald Scout [The Lost Caverns of Ixalan]
$0.23Liquid error (snippets/product-price line 23): Computation results in '-Infinity'Unit price
/
Sold out