Cheapest priced copy (Avatar: The Last Airbender Eternal): $10.99 at Card Kingdom, near mint, their price list as of .
Fire Nation Turret 
Artifact · Rare · Avatar: The Last Airbender Eternal · #64
At the beginning of combat on your turn, up to one target creature gets +2/+0 and gains firebending 2 until end of turn.
{R}: Put a charge counter on this artifact.
Remove fifty charge counters from this artifact: It deals 50 damage to any target.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $6.99 to $10.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avatar: The Last Airbender Eternal | 64 | Rare | $10.99 | $6.99 |
5 rulings from Wizards of the Coast
- 2 October 2025Mana from firebending abilities isn't lost until you leave combat and go to your second main phase. It can be used at any time during combat, even after combat damage has been dealt.
- 2 October 2025Firebending abilities aren't mana abilities. They use the stack and can be responded to.
- 2 October 2025Any other mana you add during combat will still be lost as normal when moving between steps of combat.
- 2 October 2025"Firebending N" is a keyword that represents the ability "Whenever this creature attacks, add N {R}. Until end of combat, you don't lose this mana as steps end."
- 2 October 2025Multiple instances of firebending on the same creature trigger separately, each granting you the appropriate amount of mana.