Cheapest priced copy (Rivals of Ixalan): $0.59 at Card Kingdom, near mint, their price list as of .
Forerunner of the Heralds 
Creature — Merfolk Scout · 3/2 · Uncommon · Rivals of Ixalan · #129
When this creature enters, you may search your library for a Merfolk card, reveal it, then shuffle and put that card on top.
Whenever another Merfolk you control enters, put a +1/+1 counter on this creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.59 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Rivals of Ixalan | 129 | Uncommon | $0.59 | $4.99 |
One ruling from Wizards of the Coast
- 19 January 2018If an effect refers to a “[subtype] spell” or “[subtype] card,” it refers only to a spell or card that has that subtype. For example, March of the Drowned is a card that benefits Pirates and features Pirates in its illustration, but it isn’t a Pirate card.