- Rarity: C
- #: 209
- Creature Type or Sub Type: Creature — Merfolk Scout
- P: 3
- T: 1
- Rules Text Contains: Vigilance When River Herald Guide 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.)

