Cheapest priced copy (Avatar: The Last Airbender): $0.35 at Card Kingdom, near mint, their price list as of .
Tundra Tank 
Artifact — Vehicle · 4/4 · Uncommon · Avatar: The Last Airbender · #121
Firebending 1 (Whenever this creature attacks, add {R}. This mana lasts until end of combat.)
When this Vehicle enters, target creature you control gains indestructible until end of turn.
Crew 1 (Tap any number of creatures you control with total power 1 or more: This Vehicle becomes an artifact creature until end of turn.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avatar: The Last Airbender | 121 | Uncommon | $0.35 | $0.49 |
5 rulings from Wizards of the Coast
- 2 October 2025Any other mana you add during combat will still be lost as normal when moving between steps of combat.
- 2 October 2025Multiple instances of firebending on the same creature trigger separately, each granting you the appropriate amount of mana.
- 2 October 2025Firebending abilities aren't mana abilities. They use the stack and can be responded to.
- 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 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."