Cheapest priced copy (Rivals of Ixalan): $0.35 at Card Kingdom, near mint, their price list as of .
Giltgrove Stalker 
Creature — Merfolk Warrior · 2/1 · Common · Rivals of Ixalan · #131
This creature can't be blocked by creatures with power 2 or less.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Rivals of Ixalan | 131 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 19 January 2018Once a creature with power 3 or greater has blocked this creature, changing the power of the blocking creature won’t cause this creature to become unblocked.