Cheapest priced copy (Avatar: The Last Airbender): $0.35 at Card Kingdom, near mint, their price list as of .
Walltop Sentries 
Creature — Human Soldier Ally · 2/3 · Common · Avatar: The Last Airbender · #202
Reach, deathtouch
When this creature dies, if there's a Lesson card in your graveyard, you gain 2 life.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avatar: The Last Airbender | 202 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 2 October 2025Walltop Sentries's triggered ability checks if there is a Lesson card in your graveyard when it is put on the stack and again when it goes to resolve. If there is no Lesson card in your graveyard when Walltop Sentries dies, the ability will not be put on the stack at all.