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