Cheapest priced copy (Murders at Karlov Manor): $0.35 at Card Kingdom, near mint, their price list as of .
Neighborhood Guardian 
Creature — Unicorn · 2/2 · Uncommon · Murders at Karlov Manor · #26
Whenever another creature you control with power 2 or less enters, target creature you control gets +1/+1 until end of turn.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Murders at Karlov Manor | 26 | Uncommon | $0.35 | $0.49 |
| Murders at Karlov Manor | 339 | Uncommon | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 2 February 2024Neighborhood Guardian's ability checks the power of a creature only at the moment it enters the battlefield. If it enters with counters, those counters are included. If that creature's power is 2 or less when it enters the battlefield but becomes greater than 2 after the ability triggers, the target creature will still get +1/+1 until end of turn.