Tundra Tank
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.)
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Official rulings (5) · Scryfall
Any other mana you add during combat will still be lost as normal when moving between steps of combat.
Multiple instances of firebending on the same creature trigger separately, each granting you the appropriate amount of mana.
Firebending abilities aren't mana abilities. They use the stack and can be responded to.
Mana 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.
"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."