Cheapest priced copy (Core Set 2021): $0.49 at Card Kingdom, near mint, their price list as of .
Garruk's Harbinger 
Creature — Beast · 4/3 · Rare · Core Set 2021 · #307
Hexproof from black
Whenever this creature deals combat damage to a player or planeswalker, look at that many cards from the top of your library. You may reveal a creature card or Garruk planeswalker card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Core Set 2021 | 185 | Rare | $0.49 | $0.49 |
| Core Set 2021 | 307 | Rare | $0.49 | $0.49 |
| Core Set 2021 Promos | 185p | Rare | $0.49 | $0.99 |
| Core Set 2021 Promos | 185s | Rare | — | $0.59 |
2 rulings from Wizards of the Coast
- 23 June 2020If Garruk's Harbinger deals damage to a planeswalker greater than their loyalty or to a player greater than their life total, you look at a number of cards equal to that full amount of damage dealt, not just that loyalty or life total.
- 23 June 2020Hexproof from black means that Garruk's Harbinger can't be the target of black spells your opponents control or abilities your opponents control of black sources.