Cheapest priced copy (Avatar: The Last Airbender): $37.99 at Card Kingdom, near mint, their price list as of .
The Walls of Ba Sing Se 
Legendary Artifact Creature — Wall · 0/30 · Mythic · Avatar: The Last Airbender · #329
Defender
Other permanents you control have indestructible.
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
3 printings · $37.99 to $54.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avatar: The Last Airbender Promos | 261s | Mythic | — | $49.99 |
| Avatar: The Last Airbender | 261 | Mythic | $37.99 | $37.99 |
| Avatar: The Last Airbender | 329 | Mythic | $44.99 | $54.99 |
3 rulings from Wizards of the Coast
- 2 October 2025A battle with indestructible still loses defense counters as it's dealt damage. If it's a Siege, it will still be exiled when the last defense counter is removed from it, and its controller may still cast it transformed without paying its mana cost.
- 2 October 2025A planeswalker with indestructible still loses loyalty as it's dealt damage. It is put into its owner's graveyard if its loyalty becomes 0.
- 2 October 2025Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a creature you control may become lethal if The Walls of Ba Sing Se leave the battlefield during that turn.